Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d12e8afffd720fe…

MALICIOUS

PDF

77.4 KB Created: 2021-07-08 03:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f59fdab479e25c195e214166c5be7c7c SHA-1: fd5feab17d217cdb25daec204dc6867f805e1b8b SHA-256: 9d12e8afffd720fe7c05090c7c12edf0dc903c07d33f683e86092b0405472faf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://lws-realestate.com/userfiles/files/wamoje.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088331c3b7d5---xiniki.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fitepotomukobif.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9220462e8d8c15b4b8b04f487f98e3a2/waloramepoxevej.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/zivuveguve.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6bbb19b1---82247099926.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210701235844.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/77016302203.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6189ca49---16841694394.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/50703831103.pdfIn PDF document text
    • http://hkalc.com/userfiles/satok.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/bepolenufuw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f017c353f5---32814928580.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tubaraga.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/74411495890.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pibuxibagabovawi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210519143634674553gt2snf.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/77406916737.pdfIn PDF document text
    • https://windsbs.biz/files/file/jagamevota.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/47365727793.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/nokikin.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/novutifabekeruniwapan.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fononaliriduverovaligami.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/gerovarofetupiw.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/93571648725.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3cb7b4c23---78016785879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=markdown+to+docPDF 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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 17000 bytes
SHA-256: 37c7717b4006c83c327219c498e37ae1b171fff2d8aa2cb5c599b251b3aaab9f
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 10096 bytes
SHA-256: c9a3d1a7d2530a0b572cd55385566b5391f86dc8dc000fd2560b972723cd0fee
font_02_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1