Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdce1e1f67dca172…

MALICIOUS

PDF

79.0 KB Created: 2021-07-02 18:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fa57ad190ea0d31b8f988d7713025fc SHA-1: 227650ef9816602348ff0a711d521f4de97cd794 SHA-256: cdce1e1f67dca172373269e4b1a67d650ab8137998f01885387d6ec87d2227fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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=how+can+download+music+to+my+phone
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/75a99fb37370525e5537a833e532f690/49237292757.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1327f941---vasutemor.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8d3d09a137b0ffe7676e2b73a20f88b3/xegirigavamebubipag.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/302bdec85716efea957c2cfaeeaedf71/60844093476.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4a21c2c376a48e920f519ed0184e2b2f/79477927346.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5e328217453ee72ae1c520eddf099d7d/86157645091.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/146bc32139298fe1a4cc910e57b83aea/deruvokowi.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/23859096804.pdf
    • http://bandenplaats.nl/cmsimages/file/58462995315.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a078b9571d5296748d774e058fe5fab6/28966225838.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/a35015fc7ab2fe3f92e362170d8acba0/jofodo.pdf
    • http://tdvvietnam.vn/webroot/img/files/11726844012.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/825f55d7cf5de82942d8fd34696a3033/18373285283.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fe90e5e891c415e5b81664e74872578/kukijanirijevafokep.pdf
    • https://bdsvieclam.com/upload/files/tiluvetoxunitufavirunonu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cee4999a---zasanuderejunig.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ad423559b37d83602cee49ad248bfb7e/duzagozitaxibigamogis.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac066702a---95795024370.pdf
    • http://palami.by/images/file/lawuritokikudo.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/lonipafiwumije.pdf
    • https://mfdesign.hu/files/file/negibetugu.pdf
    • http://donghozibistore.com/luutru/files/kujewipibazapolutusijo.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fexilipigawugow.pdf
    • 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_off0000d0df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 16792 bytes
font_01_sfnt_off0000e8f6.bin
9cb29264951d66b4a74b1c97d81f3a29a6e57e90dfe360a979edfc7e0a79376e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 10968 bytes
font_02_sfnt_off00010243.bin
7287db704dd64d1efcf9cfa7bc05dce1b74018d3e418b727956f55272057015e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 17028 bytes