Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcfd22136da4dfb…

MALICIOUS

PDF

88.1 KB Created: 2021-07-20 12:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41fdcd07138b82272be28da79339bbd1 SHA-1: 596e4e6f7791022e0b6fd972c885c41d65695a4d SHA-256: adcfd22136da4dfb622c7ac7b2d2a4fc4162a7a8518d4f70b106719e22fc5f83
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The document's structure and heuristic firings strongly indicate a social engineering lure for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fcf81d02---76773677877.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/918a77083f3a4726d6a28e5a591e06c7/76186623267.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dfb9c5fe3---derotomotipatumaxun.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l2nohip7f6qbcopj9cu9r6udc7/17796283906.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d031be295---65900148854.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089afbb14214---bujakiledebomemafemoxep.pdf
    • http://kirakuramenandsushi.com/uploads/files/dapavigukojarudas.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609830e53cdd6---wilogis.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7cfc1f0686659bd15f5caaf82a3b59ed/3754791680.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54b2a61d6---94203858377.pdf
    • http://akkoryazilim.com/userfiles/file/16263306996.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/806c87f838b8f4f6769f18ae7fca535f/doged.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160739119b6a5f---60745435529.pdf
    • http://agataklimowska.pl/userfiles/file/tararez.pdf
    • http://pwr-tech.ru/userfiles/file/xekefefilugubojiwiwu.pdf
    • https://kompaspt1.com/contents//files/gakomorev.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a2e89ae966c9546bfffaab83d4220f9a/35693211790.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5a7cf189---pevudadiri.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/749c689afa35d0828c4dd5cc4afa4215/5175547819.pdf
    • http://hndgyl.com/v15/Upload/file/20216241032206912.pdf
    • http://numere-mopede.ro/mm/file/merumikemulupo.pdf
    • https://loyallcanada.ca/editor_files/file/3022155795.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=italian+hydroelectric+project
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16792 bytes
font_01_sfnt_off00010b86.bin
5b671e7faa17179aba424ee23d9a0bce93b74993af0f2098dab9685c28143734
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 10636 bytes
font_02_sfnt_off000123b1.bin
7d2f141a04d59dae3b7d2affd574bd9308c652620b2fa31cf6a5598b85f6a8fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 18376 bytes