Malicious PDF — malware analysis report

Static analysis result for SHA-256 8966b0eee22b136d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 01:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e11f2f650e1ec951dd2c8aad6deaa4b1 SHA-1: 249706842a0d11baa976ee325baa54301df48fb2 SHA-256: 8966b0eee22b136d733418fcdc3a8ffb729dcbe09a5d53a2d90ee30eacb3c489
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of multiple PDF_URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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 https://chcial.ru/uplcv?utm_term=ferroptosis+death+by+lipid+peroxidation+pdf PDF link annotation
    • http://140.121.180.103/ckfinder/userfiles/files/wavini.pdfPDF link annotation
    • http://grandinspirations.com/clients/75274/File/38606383558.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720af60a676---47186805624.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/16a11d22d44715a2e3e75e69542ec0f0/bubupimadawek.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/52304074919.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b94f27b8d1b2d0c5b42957634b12bbb3/86501981249.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jerugasuxozazos.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf51a641d3---bufiwuveziresuj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9bf73bf91a48c53f6e278cfa77fceed5/jegasabudevirurav.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ef2bf25b5c8fbaf6e6d2143048f2338/bilax.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/41e8f306ee00924afebce57fa21a1ff1/dusuwozu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210602053008.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/58957196254.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/rogel.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b15d8504---vamog.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2e2367a165f6b8d5117b36a7af4a1113/mavikunawepa.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/8109333237.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de622bcc4f---vadaremesukenemomej.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/witenavuxewumotorol.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/92178026442.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/31585248998.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wikovixuno.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zitiletodaso.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/loxiwiwipesevubet.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/55069352973.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/33356580855.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 18164 bytes
SHA-256: cbfa4102c112c13f254e06fcd8910ab73dd931da0817e39a3155109a8be82da4
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 10928 bytes
SHA-256: f25aee8d2f27150c029850c2883a468b3da79e048b2150d0400d9ce516b599e0

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