Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa664d0094d94846…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 09:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4691ab19e5fbf2acd4bd8075b014c777 SHA-1: bc4154ddcffb4578952ecf65654d668536833feb SHA-256: fa664d0094d94846146eac907bd94a91350bdc3b8410a3d851a0116b95ca89c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dansecyr.ca/pdf/file/todaxusokijonefowepilomiz.pdf In PDF document text
    • https://chmelo.hu/sites/default/files/file/39990067813.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613034f60e624---74041200452.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/028b48c93d234219b85355fad63f7de9/76872178507.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hniev0at1mkc0kr2lao7lphg83/baluneritofutakusid.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/muwekisirinonojubenef.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/28433311834.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/12477641000.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/03a5541b233f0f8b2ee4d761485f45f8/kigamuvuxumogibunipiwi.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/kitelomisigexibegituxazeb.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/92702500137.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/womenodevivofukozevif.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396c707a30---fipute.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610528ebce10e---rudoxixijewidas.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/91222181435.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/xonow.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/6884294597.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/399f6eebc654df5e0bbb0844c1b5cc38/2669646866.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109011710015531.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/merokifajuka.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/vamobikikimofefofe.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/sixegiluv.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070fac55e3---90165718654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=prostate+cancer+treatment+after+turpPDF 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_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 15620 bytes
SHA-256: d2eb8b10132a732e4e3352b9c490c78d49e419a941dc90415aa72e16f5ceeeee
font_01_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 10604 bytes
SHA-256: b323fb5ef69f996f52ca8a1e8782170cbd63b664c73a2e21ebca7a2eb4e1f0f4
font_02_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1