Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b1330686ff9792…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 06:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c89b3f15bce67995d08340778a06c15a SHA-1: 2eda4f8fb50463b7cd1a62d9692b4529d67ad24e SHA-256: 79b1330686ff9792d310c2217fafcf16e745d06f4fcd0ab1f034aadd38e4ec1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing and SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laihoawedding.com/app/webroot/upload/files/79780349673.pdf In PDF document text
    • http://emailreceptionist.net/userfiles/file/89346602234.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/2465331852.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90f4ee178---21253732939.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161142ca80a00e---23579135114.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/gunewiwev.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3ac33ac3b7cf54d18b4ce0abab18e1da/84607030056.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/zuruferimomilagoketarate.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4aa26a4a8db3aafce8dfa21736132b78/favorazenesatanurirezon.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/11d92e80298353feaefc3ab464cff90f/nogikodog.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/27084218431.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/90613501735.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160746c4ed728c---pilumazifitid.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/lozolomegaporilipadolotob.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/nuxarar.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/66f8eb83f5a49f776c2f72692660751c/daxaxom.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f01f7534847f3a94499010274e419f68/fiduzofujasoxesasu.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/48083445475.pdfIn PDF document text
    • https://energooptima.hu/upload/File/jarilop.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/pekafupipuwakurezukos.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8cad7f766d06e22dbdac1641f5975fea/vovewuwexonawebotawedinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=engineering+design+graphics+with+autodesk+inventor+2017+pdfPDF 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 11524 bytes
SHA-256: c6d350cda394e140af2df93219317a5bb48c30724b0a36a3665767d6319b4c1d
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 18512 bytes
SHA-256: 9ab9db385ad88793a7161206cdf7128aa96521e5476f97a90a0e1e048658d586
font_02_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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