Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56fcf621401e278…

MALICIOUS

PDF

64.6 KB Created: 2021-06-19 21:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1fdf7b10aa4fffea3388970e1778edc8 SHA-1: 86b5703b7f97cb2c1e0cc0f36926472e21cf7b23 SHA-256: f56fcf621401e278b77c87fd915d1c3dbcecd4130cc6b5952d97a1b01a723371
176 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URIs that point to compromised WordPress sites and IP addresses, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body text is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ea5c326697b4ea30a2d372ceed64a6b7/valepumusadajodikotok.pdf In PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/45770152552.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6b68e23---gemizer.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jirobezenazokatiguv.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875112f248f---wajuwegapiziw.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/59e1d06ec335ff6bb3d6c74b2fd3b30d/balelogavi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a5a6137d---26234307258.pdfPDF link annotation
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/40e00f53f4b11a501af770cf3c1ae450/96710024447.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10092181529.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897963db226---bivufevekedafewavefivesal.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/posujuradidopigumuretig.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/203532dfa9a22917ee75981d8c3fd208/bujutidovaveboji.pdfIn PDF document text
    • http://aimic.com/userfiles/file/36151721004.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/takamodoxakebujaged.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/folewowul.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/vemanapegodasinesugowoli.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b445ff2b8072b6f2692e41bf91dd9637/8359326830.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8aqpvh4k551t70odmh0536ulm/16978898971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=install+hid+compliant+touch+screenPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 5248 bytes
SHA-256: 432a00e17638fa434dab5779c401208178501c88be5fd9d3e8a2b01e2027f95c
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 9660 bytes
SHA-256: f9a7b7acfe42104b235e20d6dda51da4479e601436158ee3fa663801bb54eb2e

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