Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff2eee86332fddd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 06:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 772e987ad1c99658e8ff67833bfa14ab SHA-1: c654a5d578b823ef46052578297b5abb262ef10e SHA-256: 0ff2eee86332fdddcff7ec7771ba84e5d43d566c8b152dc9b34c532d8c8a9b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall heuristic firings indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=mckinsey+pst+pdf PDF link annotation
    • http://ymmicro.com/files/files/pananegurezesaje.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160908cf742ccd---11646358414.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77858c10ed---vunoruxosatufato.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/dumamotujelisonevogaxatuk.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lerptrf7oushh88acdo69rpciq/23542366970.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/83240382616.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/49581609382.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/27715484997.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ab71b381---falejitolasapobovejope.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/65781618921.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/68804402388.pdfIn PDF document text
    • https://adikkedua.com/contents//files/jalodinilamona.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e19b86799---dapolibakejeforanavi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/213e703c1c3f4a72a644186aec399a9d/kugir.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/kuzuk.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3eea88267---nimojudiriwegokerukafene.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/totatatumituked.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/29965866153.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5563bd1a16---puzutuminozepewaxot.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/54024124981.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/82214663561.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vevazas.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f00fb20---259982313.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/32141935698.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/5377684646.pdfIn PDF document text
    • 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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 10384 bytes
SHA-256: 8d8b38b9bf7703b88ce0af332e988687200005a6c462084ea8f65523b1e36b54
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 18120 bytes
SHA-256: 74feedd803739ac9a7913859f50a07eeef8755509250d2e3e3362dae9d0647d6
font_02_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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