Malicious PDF — malware analysis report

Static analysis result for SHA-256 b897c1907bdfb2f0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 06:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 296e3072a9eb2542d2434ebc21fe9fc9 SHA-1: e5fddb860949dd5ddf5201b377253c4ecb414d10 SHA-256: b897c1907bdfb2f0c486c65852e2d004e7f703daaef9ddcdd47eb84dd97b7a6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a likely phishing or malware distribution scheme. The PDF structure suggests it's a link farm designed to redirect users to these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5bb46ea55---rojuxamifirifa.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2b8dcf71cd35d2d896c0efbb9db7b346/totezugezesifidomanasig.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tvtdeddhq1lrg9bffqf1rmodll/safibevamobazu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607118acb289b---sukekoxi.pdf
    • https://motoquadro.de/userfiles/file/25381236241.pdf
    • https://digireg.ru/upload/xaredezevunitamezoma.pdf
    • http://kripasec.com/userfiles/file/47569751895.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9b2a2572---volezemimelogu.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cb7791ba---wiferipubutumof.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969c1ea616---kujirikuroxitufipanapido.pdf
    • http://guojingmall.com/userfiles/file///fipenukuxizumivureju.pdf
    • http://cc-loges.com/uploads/file/gotorologerefunafefoge.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ea25e686---jogezomamoge.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbb5db78a---521353137.pdf
    • http://sklepjola.pl/userfiles/file/160919804.pdf
    • http://chongros.com/userData/board/file/xakimime.pdf
    • http://gelikonline.ru/content/Files/15533603110.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd0d3b879---9882483576.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ddebc8c06---99713173285.pdf
    • http://files.ibiza-ferien.de/file/81859308608.pdf
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/rosoludiwatirenibotuwu.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0007d52d86---55622986096.pdf
    • https://moolans.com/uploads/files/fogukisixipalavovukutofeb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+de+bienvenida+empresarial
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c91c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 16792 bytes
font_01_sfnt_off0000e133.bin
4ef5376c1906e62cef2824eabf44ec96859c9e6c0a34f30a63f377d051d2c4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 10636 bytes
font_02_sfnt_off0000f930.bin
2984c0fc277eb5486c9edc6d1b90d8fdde8279847f5c62ca0adb54715bae81b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 17664 bytes