Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0c916016948b74…

MALICIOUS

PDF

74.4 KB Created: 2021-07-01 00:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d04e3c3a0d2d15a8096599e4417fb66e SHA-1: 3d5540acdc2874d54dae34d3d185d6c2a6fc3a6e SHA-256: ac0c916016948b74f5caff3ed9864c88513f6863ab2651e90f71ba9876509266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The file's structure and embedded URLs indicate it is likely used as a lure in a phishing campaign, potentially leading to further malware downloads or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=linear+perpendicular+lines PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdd187579---powinuliso.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/81519482422.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gqcunulm004h49qp77j3vkq3v5/55527834289.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7b76ea34c37869132f0d62d17125e4a1/58550680648.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56614b0a8---50857534626.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/39481070007.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7912ab9cd---73033582785.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3581aeb6d032e09bd8b8be0f1c0d3922/muzolari.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/kubarojaku.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc43ac7fb7---nijufabonoperiruwexo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad964dd0a---gujeni.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/jirixe.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210619061030_yoph4z.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vj3akfbuod597bmgs25hbu0d7c/96900072379.pdfIn PDF document text
    • http://millecolori.it/images/file/95604586054.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/94ef45a8b1d95a364be4927163404d60/veguwuzera.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d912ea5ac28---javerevisonebu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a65439b97b08cd00ed67a186339cc961/43181646257.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/vedapudumamajob.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/moxudesubojanokekaluduxe.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/46071713870.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/79925242144.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9060cdf9bf---75051746410.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae67be554f---wedon.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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 10348 bytes
SHA-256: 8339a491ee7b83456c3514da21971384e0ce4bd412d342a39f1e7400daf6199f
font_01_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16296 bytes
SHA-256: 76440258c67b34760ee682596d55b8b0057314a99335e47db56dff93fdb9bde5
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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