Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a122ce5a75cfec…

MALICIOUS

PDF

115.5 KB Created: 2021-06-25 19:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce864ca68acbfd5fea04f140872766ab SHA-1: e94c2d151cac25d0c8e26728011067311f6210fa SHA-256: e2a122ce5a75cfec110808a9570fd525c9dce3c18d2ac94ae0ddcdb1df97533b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure points to a malicious PDF lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=living+in+thermopolis+wy
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5acf245b---48251408483.pdf
    • http://1utilaje.ro/mm/file/komobiguxujogobejexulufaw.pdf
    • http://myucmas.com/userfiles/file/xejinulabowuzixo.pdf
    • https://banderlogclub.ru/Files/file/60630831930.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/bawisexejoju.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d51fcf8a434---kedarovatavadeliwuferaluw.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dcabf20c35ab6440aa2a8ea831844230/tinufuxake.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cdccdd253c063891609116a71af05e6c/vabulelujujijilezame.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b8c2401b491c817f9cc0d0d75e229c6d/23243016655.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nfr520pv4qoi8giq1gn11al58d/46449876154.pdf
    • https://eberli-medical-supply.ch/upload/file/73885027859.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/799719b02de0b62b30288c3ee076bead/73716921477.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f00adffc---rexonafadogoxevopafal.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pvrv9oogp02d99fb8e4rpoj6b2/sovodadamoxemepina.pdf
    • http://afghansolar.com/userfiles/file/pelegufuruperonino.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861734ecbda---malumewezuwaboredeza.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426168a518---4187661292.pdf
    • https://108pizza.pl/uploads/userfiles/files/xaxulitipa.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608341a850a6b---36006959858.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa920a501f9---6872613237.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d2e4c3f8a2ce380a5416a7aff9c922c1/565018810.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d425544c4ce---11893944809.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9c89a3a90dd2f08cf985ec1773401991/60413004486.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ae50393a---birarivazekimasonoro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016222.bin
3bdf2c7f03a40a50ba5f765a30e4e17f31e25a11c1b12d483352f3f89aa02c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16222 10760 bytes
font_01_sfnt_off00017abf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABF 16792 bytes
font_02_sfnt_off000192d1.bin
27e0ea4257cbe9f7c3ce0343a7f994db14fd15cbf36eb86ddd611ce26d90b617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192D1 17384 bytes

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