Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a47e5f9c519553c…

MALICIOUS

PDF

93.5 KB Created: 2021-07-20 05:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 556ad60246e333f5afba8403777779ac SHA-1: 70403d83d088b5ba0c09f4a5ff4228d1b39a0141 SHA-256: 1a47e5f9c519553c7f79c0b655aa072e46f06062fe2f56f46f8e33c5f8790960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. While no scripts were extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://agrilaui.com/userfiles/file/difutalawuruxelakeguwofif.pdf In PDF document text
    • http://nexxosrealty.com/userfiles/files/43687519585.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/76895448393.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/65750527843.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zipidole.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/62240388165.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/foxixapofexuvumuzomag.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/379csino62ou278rs153svb4no/39661434038.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/46074491832.pdfIn PDF document text
    • https://wsbtitan.com/images/file/88801967186.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pitowiturazegizezenuwi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/da5d1e6eb34cd9a55d79479f6197369b/zebosegikamaj.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eed87ebe3a7896b94d9fb656627e72f7/1241776509.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0f7ed55810aa193bcb19c9cd692a3e04/buzulumifilini.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad30b7277---riziwekezufoxogiwukabitu.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/34854418248.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/torepume.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/remogilutulovorubupadat.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608325e28eefc---bitabet.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d268290140c093efb27a60f36f4650db/66855616171.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/navomatabiranenunil.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091132736b27---mubemararuwaxafuwixewa.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/9864685816.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/lomaruwiwizowesez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lbf+to+inch+poundsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 10472 bytes
SHA-256: 500452fd8093b30beacc5018011dbe1a00b838fe12906351599162c5a46b8649
font_01_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 16900 bytes
SHA-256: f8f41a3f5325aedcb0532bd0cbc8e65f5b37b1d4bddc6fef9393f0a9b4310e79

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