Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0464715701fcb3…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 11:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7731c4a5b20ebc98506ef101fff145bd SHA-1: fa9670be3d9fa95ea3db3488d0b68ab3a453abd5 SHA-256: 0a0464715701fcb3c59e8afcab5438c67b7d6ee63c3dad6527ec044797da6485
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 is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious content, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://broadmoor79.com/clients/864886/File/wukoz.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-13/20210613020126785964.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086861be456f---86043313276.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6439ea3b14---kofavufodizegagu.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/dadidevalitimajiri.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9aa2a294f---81814949313.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tojuba75dvdu3qhjutu1friqlf/fanogunumisalaz.pdfIn PDF document text
    • https://soechi.id/userfiles/file/8435954503.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///mujokonolufulosavesop.pdfIn PDF document text
    • http://cke.hk/userfiles/penop.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jubede.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/61821447363.pdfIn PDF document text
    • https://btegypt.com/file/nudutejibizelaluz.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/64389744045.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bf33ad87---tipilixutegositewakajer.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/42376ba0ab72bf52fa6af03ad1502de6/98331512280.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec170df8d93adfe6434a845f81316024/vimeriliruwazutek.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16117846ba7d82---lajogezarasepefisunilaxa.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/73728078411.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/duwisiguri.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/prj2umilculec2a25ca2lljsu5/3690841044.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/muredorerenoz.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ni9l6s2m4s8hgu5vg3vv1do3l5/vubenoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=quality+function+deployment+adalah+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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10892 bytes
SHA-256: 81c8be47bb60207c918e32735722388b9259959312ab71bf37efcfa7826ab91c
font_01_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 18664 bytes
SHA-256: f1b4af595d21ccc3e614d95ec3e496c8a7c1635d671ace46ab30bba2ec52bc79
font_02_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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