Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44f5c33b886275d…

MALICIOUS

PDF

111.4 KB Created: 2021-06-27 15:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 63f88aec11af28d9626d8e478fea5b42 SHA-1: 72fa928b94c2673b2cb43b82ac68d4ff2ba7de70 SHA-256: c44f5c33b886275d83965a71756d682261fd2d0b0771c48aa8ccacabf15097ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress sites, suggesting it's used to distribute malicious content or for SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a5dbdb30f---negugasobufetegogexojaji.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5af0b2a5e1f89f061cd61179ecb51279/zuvapubaginesonegazu.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/ditezinisavojukegolax.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/bekagofovipin.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/kagurtdfl1ksieqr3l9g26hjii/61806760469.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/jivuvuget.pdfIn PDF document text
    • https://congchung7.com/upload/file/fimojebafosefa.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/fagamapu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090febd117d5---95953243421.pdfIn PDF document text
    • http://mextro.de/upload/files/wexewezigowimoxizimebiko.pdfIn PDF document text
    • http://amdind.com/userfiles/file/15448419701.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086788952d2e---wivevubakidob.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13c5eebef---lebera.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/tetifesilavibim.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f93108e64---jepuduzisumogurotaridan.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cc733f99---roliluzekeke.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3c1b919c64ce7d633ebf37b2707fae1a/napurus.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/cf95500b9752961846cf74821bbc6308/dirisuxekazebov.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/bazenelanadekumobu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51dfb3490---99927210738.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5bcc1975---56787642965.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/88575223635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=north+heights+lutheranPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15464 17012 bytes
SHA-256: 3edf8a358ff806702f7d2e1718f86972fa592957bf2a1c7a1284521c7eaf61f9
font_01_sfnt_off000180e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E3 10464 bytes
SHA-256: f8a6548677e3ff23a323ae3e88e02cc1d4565dbb8a14a8ba4f549a3fa0fd4e0d
font_02_sfnt_off0001989d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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