Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc90789c3eacd958…

MALICIOUS

PDF

80.3 KB Created: 2021-07-19 09:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3511051d66d2c492ecbd76363e48e3d SHA-1: 17dbb2fdb5c4edaaefc4b735e24ebf9775673c1e SHA-256: fc90789c3eacd9580b7b55d272b51a392fa8ebba4069fcab816ece36ca6f8ef6
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a callback phishing lure, prompting users to call a number in a context of billing or security issues. While no scripts were extracted, the PDF structure and embedded URLs suggest it is designed to lead users to compromised websites or download further malicious content, likely to facilitate a tech-support scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://corporacionnoa.com/UserFiles/file/45952790819.pdf In PDF document text
    • http://7onseventh.org/clients/868256/File/josimikanuf.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pnj6noi3cllunh20da1t9n0ec0/39291167882.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/56306599458.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/netikawevudagofem.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/latirugamurimu.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/47476959669.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160790ee3178db---tusolipop.pdfIn PDF document text
    • https://faceless.me/userfiles/files/32771004299.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d941dc70---pevalogukasaborigigo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/83fc3851612f7c039112d7b52dfcc6c5/dofezow.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95543169611.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c54875a3---71219000108.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/af689f7055ef9eb0944ff21be498915a/sazimef.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/muribisojexediwixutujeg.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec97de2c7---kamim.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609270eb5694a---guxinune.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea25aec90---19026823039.pdfIn PDF document text
    • https://faprosid.com/file/47869839103.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/viwivetonopunusox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8c77b729---16688260305.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/41858627382.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf1fbd0de---xejuvarax.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/177dd9c5or6svogcghfh901pb9/gobafafogusemomotisozo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/racob22hhm5fn16s5681dfrabd/dupukuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+2+digit+numbers+are+therePDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 11200 bytes
SHA-256: 1ffc434e7d5b13a33e0212396728da54488d7533ab60c2d038e043e3ba4d2b08
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 16448 bytes
SHA-256: 09e806978641691fc8a02246b5410a575b468859d6ff33e28220f74be69bda96

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