Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c83c7a3f6d236…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 07:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6aa4b996134e02dd2a9b9e87aef54cb6 SHA-1: 88a0c3709f25652e6dc787003657431ef2ad8406 SHA-256: a65c83c7a3f6d236595f538d86f76605aec8da4cb8cc39ac1f5a278dfdb5cb2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/851e30dc968ce6c89140ce168bd9cc85/96926588165.pdf
    • http://asianmosaicnyc.com/userfiles/file/72754197828.pdf
    • http://lumieretvie.com/userfiles/file/6836787535.pdf
    • http://eatatrudy.com/uploads/files/75852618561.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608416a0c20ca---1062782430.pdf
    • http://rideabikenews.com/user_img/files/99473581930.pdf
    • http://hasici-pristroje-eshop.cz/files/file/lofupotezutakofobaje.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9bc2a864efcb64b6a3093305207b3465/59560226327.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/589917d1175b560cb07f5850751a1035/wimadadipivadibawosanu.pdf
    • http://zabradli-znerezu.cz/userfiles/file/23421564521.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c610d740---28053872004.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609930fbe82d8---44931039674.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6b51238fd9cd3ec584d7c6c1b0e24659/26745023027.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f5f54d9b---62756717721.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ff8e90b29---7487488184.pdf
    • http://agrobud.net/uploaded/file/60523157334.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/39732012140.pdf
    • http://ankamet.com/userfiles/file/5860556906.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/44620b21d5edc6ef482c26e79a47b891/fadizosiganumino.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e7d555b8---7811918431.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741957c870b---kanalonivumapefa.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f4b943e1e1b4dfdf1669f1ab89b56f51/xudujawuz.pdf
    • https://travelworld.ro/userfiles/file/30593494066.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822f439552d---jefezogetuxivopus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=difference+between+iphone+11+pro+max+and+12+pro+max
    • 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_off0000f2f0.bin
e9544772f56a1e9f2c3ef0b66b41d00403d5ce9d1c6e8ba6fa4d2addb4ecce0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 29160 bytes
font_01_sfnt_off00012d09.bin
81e7043420ad7ebdee4c941d24a1cb3ae4c7186cf21a8e73786827fe634666ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 11172 bytes
font_02_sfnt_off000146ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146EC 16792 bytes