Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e7ffaf833fbe63…

MALICIOUS

PDF

82.1 KB Created: 2021-08-22 04:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d1bbffbe66009bfcf9072935ca22faf SHA-1: 35c9b91109645f91a3162464c3604db8fed4cf2b SHA-256: 76e7ffaf833fbe6397e012fd0c5a224ac53e27b3c9b23ba233cf64afc5930c82
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://mutitar.com/user_img/files/safelizefeviregavixideg.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161004e802c71f---votowovudikujupekifijujof.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/43828763693.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08cb262ee---51083667387.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/zanexifononi.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/58044685991.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/24876269290.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kmh8bfd1eugutufm622rrf3obb/19979116471.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec77ac1a---60727405072.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/ladovof.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/30103468653.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e99fa4a98---pizoxagivofilamabutowote.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1178033425.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/ralobibar.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/86473193270.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/pisewezedajozegulofe.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fejadaboberewavi.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/80583385600.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mdlq2btns9e4kic3ei8mgg4j30/jezabesutipokalaw.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077544f261fa---vonevokamefozemubofusi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33fc142f6---19061582839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hipobromito+de+calcio+pmPDF 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_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 10532 bytes
SHA-256: 89415fc3617531b17a738a0e9ba155e8d5e837ad6fa04d5d140d8d390e8ce1d9
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 18700 bytes
SHA-256: c5916c79f8ae30f395d7aa67987e90a301f98a981b12e9b64f56e372bc16fff2
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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