Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cf44aebd018350…

MALICIOUS

PDF

98.1 KB Created: 2021-07-24 20:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26a2f382161a8fb55693def7844f1509 SHA-1: 3aa06f19f075064eae5bc9e340090c47a7ff784f SHA-256: 99cf44aebd01835068f6d87506213a3def841a6a1b33279c0775039e7875580a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://elsekmont.eu/userfiles/file/dusalovodikegofiwo.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af867637e87---rekowipoxodosivexamiliwa.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///98174253036.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/8a21cf6f941ced9f802e7a78f545f217/66784278130.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4uu95hhrll3sl1c05prh8cs836/gelufusapakipafof.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb70203832---29068518334.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dde1ab3e4272726f379bba9b980f571c/bejejulexixoba.pdfIn PDF document text
    • https://digireg.org/upload/wudaruxiwekotejawof.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kebowijilasodixadurobunuj.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/nutaruwadewud.pdfIn PDF document text
    • http://mariancozma.com/_user/file/puwilatefolati.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8f34a85f02bc7a2b39d8a30b7bf24b17/23480486846.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/t9mfncio48s5leet0bl6kg3l4u/zupuzakomunukigovowevomo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/95333185147.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/160cf7483512bfd9fe7bfe23b96bbc83/dekobab.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/jilimurasisiz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/88547898390.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/48548065340.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mopnoeb6143h7jg7qem9pviu78/49720161203.pdfIn PDF document text
    • https://kartplast.com/resimler/files/9605942322.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec4ad59445---14494808836.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/80215117472.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2f3a2053---jaruxixamuxa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb4bc1423---59105136375.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc4dd60a3---94576130926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+program+a+hunter+thermostat+44550PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/71d612a6a4b0d679b13f3eab7f39c9b8/56190025737.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_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 11072 bytes
SHA-256: 3512076d5e6d196c3fa8ce3b545c4bc78c7cb753f69130b7fe330b2e923c3720
font_01_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 18480 bytes
SHA-256: 38bd4e3302451d4721b68dd4d3dc6e990ef046333223bbb2beb1ca1737959e9c
font_02_sfnt_off00015f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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