Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab5814ce244c3ce…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 21:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5659f68f403020a944ab760e945f3ec SHA-1: e291f8592e30d932b40c52e298672401487592a4 SHA-256: fab5814ce244c3ceb44f4f3ba50bcaedf4e209bff86a207a28f86abe0baee12b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites, which are designed to trick users into downloading further malicious content or revealing sensitive information. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=tcpdf+multicell+max+height PDF link annotation
    • https://ascii.tn/web/cgi/file/75659343362.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8b6dae6b41bc8e3553ca01ad376de031/43540921315.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961723cad7d---4199054792.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85267933423.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/17609245715.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/wedotavabe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cb5b6e1e---dugaxeponaninogukotisoz.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/xufenivomiguninekoxe.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/78222031472.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/1031091751.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c575929dfc---40316709891.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/81aa1dab45e2bceb87933f3706514a6a/toveru.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/2410367690.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/r14p65et2kqrd4dra2bodsesd6/85654075842.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vixivinememe.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/18661952658.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/50837045279.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/fomubaf.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e930a7d6---bifemetodelezege.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/32f7544b21715900b4f231c6c44f9006/tesoziwudibutufumit.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/042151344575.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613180bbe8f75---kilegonisuru.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/74662784229.pdfIn PDF document text
    • 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_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 10740 bytes
SHA-256: bec5694ee003f31e75fc5eb2ed07dc4e960f561befd059c61af9f3e71f1fab3c
font_01_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 18472 bytes
SHA-256: 93200fa03479bf1d1d1ccf3a0c9d4284bb9305bd777c16c71e7808dc0729719b
font_02_sfnt_off00015c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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