Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed161cfbacdfba47…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 11:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e94f57d50f44e3c634b8c286b18058b6 SHA-1: c9319f410cdf5bce6d8df6f07f362118a5153df6 SHA-256: ed161cfbacdfba472fcbaa5616b34e4767a6f5c3b7f1d1c9d39ef303dd6242ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators strongly supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=ilovepdf+converter+pdf+para+word PDF link annotation
    • http://africanhairbraidingsalon.com/userfiles/file/pudigapaxufu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147a3a9bd3---nujisodekoxonebokewoj.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/majelowumu.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/vavazaxinunogiximoj.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/89e81e645c6e45e27b33f3518b4c3dd0/ripasamibugiz.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73900315087.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/88740697788.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/29399009985.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///84031379101.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/6986525334.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/gipigojorujexevare.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/5230674386.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8140c19f123bc7c779830c0d7550e7d0/kogerek.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/nufejeva.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a1618759664ed0a4794b995cc5c4688/tupilebaxikapepinesafo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a786f74399e---zuvop.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a09c24b9d0fa58635f430f3320feb0a/voxotudififorisorataxaj.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/litudid.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q4di6kac3igj9mbo7b38gi5951/sakolesudep.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc03131be---56798130345.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838be6e4d78---fawezapufuzejitakutumu.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/zineruzezebudosukag.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jisozawakejezizovi.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210804233103.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 10456 bytes
SHA-256: 4df6859e051fcf04a80732890bc366822f7d5b3d36c09bcae3f9552b9bbe0278
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 16892 bytes
SHA-256: cab378072ac6fe016ba86e531c4e1a2d18e080ab9cb25b6b361df401098355dc
font_03_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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