Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee571b8141e2aeb0…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 10:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3a4495315d05250ac2f52434d41e610 SHA-1: 1fcf2918e6eef11e29e7b27d30079eb09854e552 SHA-256: ee571b8141e2aeb088e7050e768ac2b8d557eda0114ea85310fad101907f0f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=2012+golf+tdi+manual PDF link annotation
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/42094f88f4d27b5ba037fd151e1fa47c/45244347127.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84413336f---muzapugizoxepenaza.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/tenabubigujeta.pdfIn PDF document text
    • http://emaaravm.net/upload/files/99742272494.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/57637174531.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/28768541732.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/83b692cbb3203a211a96cde847f8429a/10074172747.pdfIn PDF document text
    • http://accronline.com/userfiles/file/karupal.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/bapimofezigiwurojog.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/dabipitit.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/38337020500.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0sg7rk1et9a71vnqs95uuu8ujg/90011603209.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/fujorexufukuwevuropiva.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f851f390---11664414336.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f058b3d5b4---zitadomitilirewixudam.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/28809787627.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608abcb9f3c29---basawe.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/32977783086.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210829081509.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021072804021773499.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03ce898d4---toboxetotin.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210704_41AC48A0F9768C71.pdfIn PDF document text
    • http://vce34.ru/attachments/file/rokifakavadam.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_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 18016 bytes
SHA-256: 29d374739d26f1645bce17777423f0823bb23a7b96c462cc17d00e10443884ef
font_02_sfnt_off00014b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B89 10596 bytes
SHA-256: 2ce35d0963d3e4262e34b8f17faafe6ee03523075c63c394c7401f72f3c24af4

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