Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc00594564bf3dab…

MALICIOUS

PDF

99.9 KB Created: 2021-09-05 08:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47e5b8b04161bc8c31bbcff11869dfd9 SHA-1: e2da943c905e0925114a21c9a59448357cab8758 SHA-256: cc00594564bf3dabd238d6aabbdfeaa36ef7c4282bd5a1ff5b507f8ef7a2dbf2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to use these links for phishing or malware distribution. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://camonetinternational.com/files/file/siguvape.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e3d91404---83833073143.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/akkgp2re74gekd07tm0jsv3upe/bugisogijowujexuvumisesak.pdfIn PDF document text
    • http://cityfate.com/files/files/gumizadunikagagosus.pdfIn PDF document text
    • https://codecs.ro/images/file/jurotitobogujoror.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/itkp8ivq4ktnnofsctv1o4it5p/pajadupororaned.pdfIn PDF document text
    • http://stroi-sistema.ru/img/2965563315.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/87949685730.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/vuxad.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/90610304080.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/88591911484.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/29063608476.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/55616720011.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/84098984477.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t5aio070e8da1fc6jlspld56f1/43541706079.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/11492529167.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/593acaa79f34ff2e11e2ca24cdb205a8/10231424251.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/suzaxusumejawaninad.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/79948325460.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38118446556.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/zuruxawugoxunebulitaxuni.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/butezixedeboboluf.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/bijotemupeditileduvitigu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/36147686458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=onward+christian+soldiers+satb+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_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 10968 bytes
SHA-256: e182d8a425135ca5219da1847098d2cec963864908f264c38e651a0f57c61a32
font_01_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 19188 bytes
SHA-256: 95e579df2ab692be1e3c4fdbf4a672d1a0d9861e531cd113891250e1c1ba519b
font_02_sfnt_off0001695c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1