Malicious PDF — malware analysis report

Static analysis result for SHA-256 59db56431f38d409…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 17:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7b51bf113520ce64bef5c36ad6c13d2 SHA-1: 6886292ae2f8cc6a2b57b26bca193533e7dcecf2 SHA-256: 59db56431f38d409eb0259fb4c31731b2f793048a13c4c065d740863e1edba16
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of numerous URLs and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://zivotzaokny.eu/res/file/dejidopiwamabofalugegubez.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2d110347---22015092898.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbc37569b---fugisisijotopuxopawup.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090804170911.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/59073893352.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/2996490272.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/73667254615.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xeduvepugenedukafupexofu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25083827667.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f266ff09fd---98606050937.pdfIn PDF document text
    • http://reichspfarrer.sk/file/40678304604.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/nenovisuvafexanajawefugaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jh28nas9q8os35p78nvn0f8c3b/57243749724.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/zamubumiwavusaxatopem.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/tovexarujonufuzositujekog.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/58628584634.pdfIn PDF document text
    • http://a899.net/userfiles/file/63879521763.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b75af968---56462454197.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109101805553327.pdfIn PDF document text
    • http://imoroz.by/upload/file/bevaxetarilin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=among+us+mod+apk+11.17+aPDF link annotation
    • https://b2cdemo.tickets.com/content/files/15013838732.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c7f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC7F1 16668 bytes
SHA-256: 6c00ceac780d3f422ddef1c614ceb0fce5064fd832f35bc1808fe21ba17941ab
font_01_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 22912 bytes
SHA-256: e1d6c2a63b46dcb064ceed2462704847aa99a2945a1aa25a8f31bc9e76679ee2
font_03_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 10608 bytes
SHA-256: 9ee47ef1f6bf3016aa2b1f0eb2ae0262e714843abd04e7c8592dbfa01295cb74

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