Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4858a6840faf2f…

MALICIOUS

PDF

81.3 KB Created: 2021-10-15 22:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e2184265293ef2ceae15aa63bfc5e80 SHA-1: 55e355b93592ceac15e9174bb20922b5a6893247 SHA-256: 3c4858a6840faf2fb94a0ca269fa96b7ee7537e4395b50ff44fd5505d3d86b3c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it's part of a link farm designed to distribute malware or lead users to phishing pages. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=chemistry+class+12+sample+paper+with+solution PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/071cd1fbf0b5eb69dd500f2c14add7d3/zotuzuberonujegapeg.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/guvofoxapaturarolibodaze.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161644319600d2---zenidaliwosaxatukikenogu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/16093961918.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/17022293873.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/62056523833.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/15445708627.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/15756048890.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce6e930f03---kubawudet.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/tajananiladi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/60018650338.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/68748165551.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jarovumobogazulanu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d901e8f5cd3a538d7f6890701b2ff953/wafoniva.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/33639703660.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/67382504106.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/aqc6h1m2nue4j9s705cgf8tcj5/woraxelesesadunafemodo.pdfIn PDF document text
    • https://online-wums.com/files/files/zugurekuden.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33618952775.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec6f899cfd---jemazivemabilafesulis.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/dodivotiwixunate.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/63316563027.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b87d47414d---26475827415.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161571c6c6b5fb---12550418651.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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16904 bytes
SHA-256: 54f5b4f027db8a440a10506ebb507c3324e2448c30a1dd48d50908e423ed2d6a
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 11140 bytes
SHA-256: a30a7bcdf09b61dc020e9352a90f752437ef5bfe3290a20709dfe5278d675876

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