Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e13a2ad0191b9e9…

MALICIOUS

PDF

95.0 KB Created: 2021-09-02 08:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2058bb19500b264ae708a64d1d7364b5 SHA-1: 3c5c6c1f35a9b824791b1d4417b1a7b35f5bd822 SHA-256: 4e13a2ad0191b9e988f3e181542b04dccc3db45135dac963aca9d141df1a38b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of 'formcraft' in many URLs suggests exploitation of a vulnerable WordPress plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16111940f2e494---35696212405.pdf In PDF document text
    • https://network-italia.com/file/jizebidutebad.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608854deb2ebb---96019335510.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/mezemejulokobukutejenal.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d6a7d98fa---95359313373.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/63517082721.pdfIn PDF document text
    • https://coil.hk/upload/files/noxasabegezozewowaj.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63d57f7d2---kidefewogi.pdfIn macro / runtime command snippet
    • http://agro-partner.com/Image/files/jonodijogikozeratoxakof.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/71241588530.pdfIn PDF document text
    • https://successalpha.team/upload/files/65240044941.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/3793784732.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210828180133.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rilogorupanadu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcc9607b0e---29145136837.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/10523359237.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ccec9b24---wiloza.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d6e9a95b90973f8b8d16470d87eceeb3/34312135989.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c906a149ab---60589316173.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u1ajvvkhsf1hmmeh2i6tvllta6/pefanetikututa.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/78953765847.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/nininusigofuloted.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/97167621935.pdfIn PDF document text
    • https://coil.hk/upload/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=section+80g+of+income+tax+act+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_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 11156 bytes
SHA-256: 5b1b7198282bcdbed6e72577b9d0b16b2a83a60522eb6ac3888737c5811b6843
font_01_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 18580 bytes
SHA-256: 9e2436acead9e495d40beb6fee03097b52ce533d4cc644e8465d975130009117
font_02_sfnt_off00015643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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