Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf9ad10aa97d697…

MALICIOUS

PDF

82.5 KB Created: 2021-08-16 19:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7af83cec3df9ced2899f5b67f1bd5cff SHA-1: 3541c9e830a29fa3dd60d2c6e03b603f668dbffa SHA-256: 9cf9ad10aa97d697f0deac09e10ade59e03ad1db70beb1b92eeece9654d7a59e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. The presence of 'utm_term' parameters suggests an attempt to disguise the malicious nature of the links and potentially track user engagement. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kochamsushi.pl/UserFiles/file/43192530371.pdf In PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/ziduzejikedifomofakaseg.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/sogewarilizimukidi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b1200fcebeb3dbe70722ef39729671f7/zekesejafa.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/1960977534.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/loxotekizevab.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/19654119563.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/21502045701.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088821ed0733---7148197303.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/19275268867.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b190e31ef---fusigisopafavarumoluda.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/59049127810.pdfIn PDF document text
    • https://laps.pl/userfiles/file/giwetawuvizifit.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/40705273264.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xojakuforejalugivesava.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/36704148047.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1cad57d22---68571968012.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb0a198901---61017261363.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d5f671f8739a3cfe109ccc614d0b7d53/tupumovubogapirixatu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed27f705de---29866763121.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b8ef133a---zubunafutobonixesuxelu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/giparefezupowamugat.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/peneraforoxonune.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/q5kmthhk5m7i79vl8jda8ntg62/guxiburomatabozanubav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=video+5cm+full+movie+downloadPDF 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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 10624 bytes
SHA-256: dbbcdd857aa22cdf9bdf42b580e6e968106cbc4540347d60ee65a82145b09701
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16312 bytes
SHA-256: bf3686543ceddaa83dedd9e23bad05b4d0c8a2779e229b32ea0e4d48fad45cf3

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