Malicious PDF — malware analysis report

Static analysis result for SHA-256 81217e94fbf9acc8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 03:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9df5e17282e62cf185d13e9f923318d1 SHA-1: 9cf3a93cf91d3b646842b9829b82ffba5045dda4 SHA-256: 81217e94fbf9acc8b88b0c69aae10a5870696effc6b3fe9f23d031f8feed84f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://medvor.ru/uplcv?utm_term=hall+effect+gaussmeter+pdf PDF link annotation
    • http://www.deco-interieure.com/userfiles/file/vapibamefidigamijoluk.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/rudaxugoxopamizubegu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/52i5k4ap4m8krm336c0pfver1g/joboxinepivamexoxoxi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e2759a3da2a3bc504e5d99a127cfe6e9/fivujupumelurawinuka.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ga2pibt0slol6itjmshlin5gq2/nuvaxa.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/98166971823.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/kijinazem.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/muboziwusosaxosapodivuwus.pdfIn PDF document text
    • http://geotersrl.it/file/zazimabituwotimak.pdfIn PDF document text
    • http://fruitsad.pl/images/file/runabesegevu.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/9957377093.pdfIn PDF document text
    • https://mashura.co/userfiles/files/tisuzewizoduwota.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/mqchh78bcn9p7p3crt7usqau53/fekuwabupenik.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wisifijasiroge.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/fiwezexufameganem.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78d2d421ad---nukimobufobatevudulubarup.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fl167qkksnkk1rhrgngofvbjqv/xasivuxex.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///43570282064.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/200907c43e679df8c40c5a1e4f361238/55117890831.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jutunexubefile.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/64361145256.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/985093c0bcbff75988ae2e50762c42c2/jonerowinisilamopuvokegu.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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 17780 bytes
SHA-256: af6aede5fae72ecd6a6b78433a9a81ef63705eecfcd3259daa2427d036e196f7
font_01_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 10740 bytes
SHA-256: 5947a978f09911f7bcf9cc53af6997e3b7d7412790b6b2a6b25fa0d716edc116

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