Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88cb5a5a6880eaa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 07:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b2e0afedba1d9bdbaca122f4cd39a4d SHA-1: eae4bc1fe3408ce81c615098e7966a2006a63cf7 SHA-256: a88cb5a5a6880eaa42e0aecf999b0a1b5fd117c1b1d4503536bd1b2a4385fddb
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of 'LOLBin token sequence in document text' suggests potential exploitation or command execution, possibly involving JavaScript given the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427db01c3ca---51702933408.pdf In PDF document text
    • https://amd-export.com/site/upload/file/kasejimetejawodomowuga.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/66543372116.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/sofenogeropexamisuxoderin.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/74625123854.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/60902944314.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/75889110563.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14156496205.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/40308769811.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/28414423564.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jesorefegumafaloj.pdfIn macro / runtime command snippet
    • http://bebelino.ru/userfiles/file/18144226749.pdfIn macro / runtime command snippet
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f07eee32bc699cc1a8943821a752f42e/1943621095.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/80551555261.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/finunuxoru.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/73867822859.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/59990297819.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/wazisifosumefosirapikevot.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/88398922734.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/87830568444.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/dorilalutarovebixikoteni.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/31bc2b8e156033c79aa7faaed1cdf1d0/69083256871.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/mozajorizibadutipakajez.pdfIn PDF document text
    • http://elmbbq.com/uploaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=all+ladies+do+it+movie+online+123PDF 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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10700 bytes
SHA-256: bdd078af4855619b43579e26e002075225f0cdce18d375f2aef9c2237e1197cb
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 17188 bytes
SHA-256: 9fa6b98820e89fb31f2a340bab921daa963501dca89c8b3064bd7be1f83837fd

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