Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7b2797210db9b7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 12:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 897372f70cb731bbe61a0c30faa4705e SHA-1: 263b4c369b08304826bf2e25806fefd365cb15dd SHA-256: cb7b2797210db9b7216a9c95bb3317fa29a34e97af338728da36f342dada4664
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic where the document might instruct the user to open a password-protected archive, likely to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lmcmanager.com/ckfinder/userfiles/files/jesufonekododusuf.pdf In PDF document text
    • http://lamardaegu.com/upfile/user/file/rerud.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/87491336824.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/73890303617.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22744419174.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/32541491117.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/86100738702.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/vepevexobeza.pdfIn PDF document text
    • http://vpsystem.com/files/fck/gigovapadas.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d953b9998b---22594718228.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04ec21e8f---lowuxaxaderimegidajamato.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/54717317583.pdfIn PDF document text
    • https://partetesal.ir/data/file/misapadeza.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/40965193325.pdfIn PDF document text
    • http://iltorg.ru/upload/file/31074167658.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dadilisez.pdfIn PDF document text
    • http://ttc-investco.com/img/files/81500981640.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109110225456742.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/xuloxafopiliribebog.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e43b4a75c8def935d1cdd781a472ee04/38612365594.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/6598967189.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/51981297060.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/povikapepepikitategej.pdfIn PDF document text
    • http://tyextractor.com/d/files/virivemasakakum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=top+10+lock+screen+apps+for+androidPDF 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10744 bytes
SHA-256: 3e6e5bd140e225ee2a9637bfbda627f366b9b5fd97a562fc0a23653d05248b76
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 17084 bytes
SHA-256: ea01097eb735f908423d6f1d75cda2999f86bdcfed8a5706f9951fba67728a11
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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