Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ca9a68e9f31c5c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 10:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6abe15b75cdc7931dda99b8b44bbfc3a SHA-1: 1e330eb42f159d2669096bfdc48329a45dad01c2 SHA-256: 59ca9a68e9f31c5cde178088b434a76e42f3b0bf289fe129dc14bcc67844ae48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • 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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1qtcvme42rnbujiu9kq8q46vfd/3536894915.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/akgirnb1skimf8ekte8o15vfhr/sorixoganonikifoteve.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vugiwelogimunezoza.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9abf2b3e---55717658876.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8198669ad---55265778522.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/535a515432f7f0b30da697bd695ebd2c/mikagumudeb.pdfIn PDF document text
    • http://findplusltd.com/file/webisaxo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f2aed5c70b1918b423f3f3d1f4e33490/veperejuda.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/manalidewosilakov.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b13d51df8a---63331468991.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/miropigezijitabitavoxa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83caac13c---61854323536.pdfIn PDF document text
    • https://adikkedua.com/contents//files/goxefikaguxelikupav.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q8srgho2m63arqlikuqd070nmd/97089659645.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/82393108640.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/82011966612.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/muxigigidanikaxa.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/86466575805.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665fe4ff4b---16892930609.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/46624779044.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fe8a80---31203841866.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/79005810602.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/bulaperapogage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=culdocentesis+tecnica+pdfPDF 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_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 10644 bytes
SHA-256: a36cd408f9196528cb3377c661e6b2a66e210bc1621fb53a86ffb53f2daac6dc
font_01_sfnt_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 16360 bytes
SHA-256: 77e8fb55d5aa67034d2efe823196a234f792a708b2c4e7d31501dbcd96342697
font_02_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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