Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed6fee8d3fe5ce4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 09:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8c51e766276d2e4edac6ca8b9d45822 SHA-1: 255dabdfa2773746c9544db0bc1aa8f899839726 SHA-256: 4ed6fee8d3fe5ce45b08a98a01c4acaaaf36da75d802438d2d98463c58712e8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to domains flagged as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1079ec3488---zoxawojakevugivapigo.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c155d3f3704---99313635180.pdfIn PDF document text
    • https://rjpexport.com/files/59389218683.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/zekalonofogipezof.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/papasinanowepemazo.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210823232658_542016331.pdfIn PDF document text
    • http://santeh.md/img/files/xiwadi.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/dimabukatafukalufejenemi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/tobukupofaziwol.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/80042113884.pdfIn PDF document text
    • http://aqcons.vn/upload/files/2566995628.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef65af815---dejadilamiliwo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gopunowazenafelamepawewop.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6527a6a0f---49725367514.pdfIn PDF document text
    • http://jawarakreasi.com/file/62314113569.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de4e6600d---37058183416.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/pejupeti.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/wunaxajobazemixutod.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/guluk.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4398fa1933---sisivomaf.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vpgttv75shr8q0tkqqeqcr8c54/wijusafeminojuxopewat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086376ae2eda---gakedotuwade.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/79469669078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+relational+database+theory+pdfPDF 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 11052 bytes
SHA-256: 1f4ab98876cdb25b7699c471cf0e5dd2f5acc6f10f29f84314d3a23299b60f9a
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 17076 bytes
SHA-256: 3a0b5e91f8df2e8f05b30c86e3ca226b72b5ffd00a03aa2a199c3f53eaddfa60
font_02_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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