Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7cd5e5b533306c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 17:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39d988d3ed9cb8512f6335394e78288a SHA-1: d4a3d667010ab004b67025f34d9729d2e0ca6ab9 SHA-256: bd7cd5e5b533306cc81ec3ac34efaa45bfbaf4c2086ba38de333d09748bd326c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lt101shop.com/userfiles/files/56388493721.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/3948623316.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nefopowesoruraxa.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/minogirasiwuvuxavolev.pdfIn PDF document text
    • http://halmar.info/userfiles/file/lunalutudagekotozesew.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_74C991BF5D264802.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/63706113439.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/gukobivosu.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/34921619526.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/37782550239.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/50781296426.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/dafevavoxokixuwafa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4d49833f6cacac87592063c198eba975/83370542036.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192614982767.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/wozutawuboripowanezuwu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161502c98099f5---11709596962.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/gemeturubesarebodivar.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/97294644151.pdfIn PDF document text
    • https://phr4u.com/files/mupekaromerifadusos.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614347c0d5783---wudukafagaxukavufekebano.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/69942545949.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/sekikoxedapixakagaxitul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=scansione+cellulare+androidPDF 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_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 16364 bytes
SHA-256: d9c6486aad903e8f721fad73c93c9bf6d020704601dfe526236c890667cb95c8
font_01_sfnt_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 10440 bytes
SHA-256: 29bccb7d42e2bc14d66a982108e1c02789c3fec3b809ff7837622454cc48d85a