Malicious PDF — malware analysis report

Static analysis result for SHA-256 9431673c0474dcf2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 19:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e580d8eeb2616ab2180b623c2cca1da2 SHA-1: 789a418839eb47188d7c902f8898675b44c53fce SHA-256: 9431673c0474dcf226fd5fa64c1d38484596b0a64bec2a1eaec422f3abcaf957
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm or redirection mechanism. The presence of an IP literal URL further increases suspicion. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://gernano.eu/gfx/userfiles/files/69580872806.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1287e12d8bb76c3becc8d93477bea711/detederuwuwuzarazik.pdfIn PDF document text
    • https://lasanisports.com/files/72690184843.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eesvenu4hrbbralrt5rhd3bir2/90063295735.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8582413740---39749188698.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/74187225865.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/911204299.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fe0ba90fe69342563d1b6d49bd0a85a8/86085635295.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/tusisug.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b0353d31b---26465989346.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/27449849079.pdfIn PDF document text
    • http://chinalabware.es/d/files/napuzimubiberuvopezoj.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/37850928092.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/gelizatet.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0c119326e6ab5d8f5a6260464b3b2099/89121965933.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/volimon.pdfIn PDF document text
    • http://talleresjpg.es/img/file/boxukotusetesufejeg.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/19708861351.pdfPDF link annotation
    • http://pjteam.hu/uploads/83706657322.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c1462b63683343a3498605a8463891e8/36802277327.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7000p82j0p4c0in2solemr41bl/rivipozalapotikuwesawone.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/lozukiv.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0ef7776ade57c7fdd1c2ce48e83a4239/kobawawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=collagenase+santyl+davis+pdfPDF link annotation
    • 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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 10784 bytes
SHA-256: 8ed1061fa6bb947e3aca7248d55872c844a93fea3f93edbf61c742db2526af83
font_01_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 15176 bytes
SHA-256: 2cad517e37cd6b10deb7e23a5ae12efcdfefa31d2f87fbccaa6b5c82e456cd2b
font_02_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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