Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac9f21187ab1bb7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 22:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c77397e6ecb619d1b005c95f844c9ed5 SHA-1: da0faee0de8889b4a37d0f0c59f063b0b5c3a75b SHA-256: bac9f21187ab1bb7c19f3ae5665c38cb1ecf0da4322bbfda362ffc5b7412c7d1
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 a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and links to compromised CMS uploads strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=grade+1+math+3d+shapes+worksheets PDF link annotation
    • https://salvatoredivilio.it/userfiles/file/51704099109.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/icb41n6o112ie8rc15khqmerc1/rekalu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/71172481578.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5baddd7a4e93de1ae2c7adbac89a686f/12270889486.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/41152598674.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d8df52b4b---7514781348.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/wunukaf.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/59002093998.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074180f67307---74638246847.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1e57180d---92854396401.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/botavale.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd9900c01---gosewepasamuvor.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d230b3612c---51560642910.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/farurotasoraguzota.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/57019197280.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/26628045993.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076db72cb5ad---bagulipobevaxelor.pdfIn PDF document text
    • http://techmechengineers.com/uploads/98039912199.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0cb3249802a21288d05afcb2b1bd55c/51184086201.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a996264e---26570014860.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a112d6018---10451210959.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/86785700531.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/kifodiweni.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e6d471990a046a0626c541230cb6ee13/36562473309.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_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 10856 bytes
SHA-256: d23ad10089b30e51a795987e01264ce054dc3ba816dee16643d4e69cd1670d64
font_01_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 16628 bytes
SHA-256: fa5cf5a8747c22a688b6f08d252b62ab75ef7cdf26b7fc6550c9960b7ddb504c
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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