Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba1219b40327f5f…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 06:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c06131e25c1e3c6f7752c6a252ee4b71 SHA-1: 9ea9d379547d60b714ea4fac2b9e9d97be1fff57 SHA-256: 3ba1219b40327f5f43132c93a5ffd7cfc6ac058ffb2831b23e2edb9fb771333b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document impersonates a cloud document lure, prompting the user to click on embedded links. Several heuristics indicate the presence of link farms on disposable hosting, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bf598f71d76eac4d1aba2e81fcfbfba7/4099007221.pdf
    • http://zae.me/datafiles/file/xipowinoxanoguzanuxe.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/dui8o50srgqskju22b08bkpes5/87241708950.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/040d0e2d9313fcda858177346cdfe174/fimuwo.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6a5b83491ec84aec298d913ec13458f/dotipowod.pdf
    • http://llux.vn/uploads/files/95912457334.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/4cd0f06a36a02f2074a3b85ecb3df932/visikijekim.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811da36ff09---63985115594.pdf
    • http://photou.cc//ckfinder/userfiles/files/81932167036.pdf
    • http://alexlunacoach.com/img/editor/file/15572460481.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7180901ee---gitenupirome.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7gkme05ufpgq3e2mr82e6g99e3/dofosoxuregivitafonuwajok.pdf
    • http://pechati-piter.ru/userfiles/file/15587016746.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/73be712409eabaf2d416c054bbae30a9/xebesoxedulebiru.pdf
    • http://www.abcklima.hu//data/editorfile/zesaxuxovowobe.pdf
    • https://cardion.dk/gfx/fckimages/file/lixenivosiloxoganu.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f363455ca---99404830157.pdf
    • http://chinoboxingclub.com/clients/36032/File/26228492771.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e61d8dac---83061882696.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6e535d5fc41865c0cedf32a231a6a388/23799450665.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2929fc15---87615844493.pdf
    • http://www.huntsvillepr.com/files/files/89563899416.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2rjb7819582mqmjlgtfcclcoh7/92849605565.pdf
    • http://rotang.net/userfiles/file/71560034729.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+upload+files+to+onedrive
    • 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_off0000f239.bin
194342dd0b6852d18006f3c59750bc1b3659036c266269e28ca1b2bb50458092
pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 18044 bytes
font_01_sfnt_off00012196.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 16792 bytes
font_02_sfnt_off000139ad.bin
592281f9d0f77c26905ccfc2865687f9cff63a936ebb3747abc78520a363cf6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 10736 bytes