Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc83c25de9d97364…

MALICIOUS

PDF

98.5 KB Created: 2021-06-27 04:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e5ef5e9188d5fe9a6d5020e8fecdee10 SHA-1: 3450e8710a39d81f0e807fecbffc9c1a4034b3e2 SHA-256: bc83c25de9d973644bafe8e0ea82fe7b6eead33c698037ced2578e6704ce62f4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aeb6c87bb255f0f62987f315190f8036/12430656514.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ad015170170df66482f382ad0363b926/gevaxemigipi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2cda386d4404dd77f030bc1f1d936b48/56743627494.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c416f26ab---difasarabog.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae43a8f4e78c5a53bbbb3a3450433d51/patesigijevakovesadujot.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/vutam.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/92971917061.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rd5lcff5154q0tof0h3rd611b1/65991780192.pdfIn PDF document text
    • https://egca.fr/userfiles/file/78024311013.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273837ffa9---jenapabebuvoxa.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/juvurifasolulo.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zezijifigumafogukezeduzi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f989ldq60qhrdv81a673uevk21/96425731929.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/171945074930.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/429a793d0fe65670f7bd598f91fb4d17/50408369581.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/37718425462.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/357e6e776579d5990ed5b16b8834647a/17713537529.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2905786f096059b512dfb834f94c6b94/tamodinetivusakobipuga.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/dugesuguwubofazori.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kebexaruvowozefuka.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/84368609099.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqbq56as942kj7bqonod3i84k1/95099100302.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0b97d863---89795599090.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4hb8v3hn4use3kp3ipf52hl3bi/jebubajapabixixadad.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcb8f34d2---dadenidifupojadutudaban.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/35da70c7a3248e824a659878f9ec1e4c/93553597476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=expressionism+art+with+explanationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10688 bytes
SHA-256: 9f47251e682161eb5796ba0484ac4ae0d28b8d6790158131f05398eb3240da16
font_01_sfnt_off000136a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 17904 bytes
SHA-256: fbe52581c6923c1faebc564cf2d02a5acb57cf589fe6a04f2ba65c4611023ebd
font_02_sfnt_off00016467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.