Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e6f7579461d120…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 16:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a15014b9d297bdec815865d5c1c7dd6 SHA-1: 79cf0e3133bc4e9d125169de2e69e1955032a704 SHA-256: 81e6f7579461d120b5b6a75a7607b3160df705a84b6d2445b45c2cf8d83f47e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload directories, and contains a deceptive download button. The primary purpose appears to be luring users to download further malicious content from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=mes+previous+papers PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3817dd29---47540236137.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4f9307cc---57967236622.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/29271218652.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7bc83b12b30dba14ec17a095f7d2f833/11212976224.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e31971dc---34784621174.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/68232500f5a6a883beea9fad0d119314/45424503711.pdfIn PDF document text
    • https://aashianarealty.com/file/34266476801.pdfIn PDF document text
    • https://123natura.com/stockages/files/43566627008.pdfIn PDF document text
    • https://actorconseil.com/files/file/muben.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/47521083409.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/415thg7b3a3eprtr3u9ikgnoa6/89149760871.pdfIn PDF document text
    • https://argumentua.com/i/file/livubegemime.pdfIn PDF document text
    • https://immobilgold.com/file/xuribemilotuledozeboki.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8186808e2a2ee323ec5846565478109e/bosakijatafozilofiv.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bd4f7fbc6---83100868621.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f57c2f77c20145ff7a6ea0683c4ec92/28747662734.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8520e4d5---40610395029.pdfIn PDF document text
    • http://prosquash.by/data/33102472065.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/6107312975.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ccc921b7---lirepirowizugira.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/18026876611.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cbe78081---repiwugasawisumamej.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/gangqpkr32jpfrj05c6p90rdch/purezovejutewaridetaxun.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/47489923487.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64be646478---nojoso.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac62947b90---vonitoj.pdfIn PDF document text
    • 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_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 17816 bytes
SHA-256: 67c1448acb7372195a80c83cd5c55b659116176618f5e1a4e44b08fc6d307abe
font_02_sfnt_off00014587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14587 10156 bytes
SHA-256: c06f862dcd84e10c50637f6f025b554e75fc022097b297e1ff8baa7ac43c6a80

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