Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7809324dc1336…

MALICIOUS

PDF

89.3 KB Created: 2021-08-05 22:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 96e38e1cce18917b23cb355a7ba90353 SHA-1: 9962d99b99dd23d16feb602337e016a5e8ff4577 SHA-256: e6f7809324dc13362cffe742586859ccc4fdf5e6411d5ffdece6b23bf5ed5a2a
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be part of a multi-stage attack, instructing the user to open a password-protected file, likely containing a further payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=consulta+de+elegibilidad+quiero+ser+maestro+6 PDF link annotation
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fa4897dfcac0c1334b8117f06011e957/fegowa.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/arvubg5469v08h760he8t6vtq3/24455623434.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/85420960771.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/u0m4e94n15skm7djokt7nb2r9t/56701073896.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/65731826177.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/6765368083.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfdaaadf5---31144504078.pdfIn PDF document text
    • https://5udua.com/contents//files/jitorakuwupuzigutojanapo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/np0nqhp36hfe6tdvbh93fh0f32/71284277029.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nifero.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/5409824296.pdfIn PDF document text
    • http://jucal.es/images/file/35528828033.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/15716292424.pdfIn PDF document text
    • https://isosklo.cz./uploads/8103071875.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3ef9862fe977d8d26074e27734211fa5/35387562492.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/effe0dd964a43e209bc8e3ebaecac0dc/gupizevilimikudazufotep.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160942b0205c61---xizulesitesadol.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/44427780396.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/70708610676.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/wuneludavir.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/7beaf887b03bb1319416cedef84d5c8c/580728488.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/motesomokezer.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/jonuguz.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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 18604 bytes
SHA-256: 635fc2292a6a0db88335f59891086cfa65f09d9fbbc90041dfdbb706738445c8
font_01_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 11176 bytes
SHA-256: e67be70b256b97e0b776348af79ce175d1381ce0909e2ae4de480238d747b7fc
font_02_sfnt_off00013ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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