Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41f59e4066bd855…

MALICIOUS

PDF

98.2 KB Created: 2021-07-09 02:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83e710512f1deac459b85113b4320217 SHA-1: f8f4bc5570fbb2a4c2e1f4fc0c93229ec29d90dd SHA-256: a41f59e4066bd8553f2a815e490aa67cce6367acd4fd52366ec13316eaf463cd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://wastran.ru/uplcv?utm_term=questions+to+ask+during+a+retail+management+interview
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc81d8ff9c---watusugevesegiposowona.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82dca50a21c91c793f7d8f4df0304337/xanodolupuw.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xozajedunifaxowe.pdf
    • https://daquin-ferriere.fr/userfiles/file/53583190500.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13a6549a3---62960726281.pdf
    • http://asahiru-ban.com/files/files/31424367327.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/zovanilanaze.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5f1af037---fatonaguberusumojiwodax.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/f4960572591bd9082900595facb7a2b1/42965684470.pdf
    • http://blevy.com/ckfinder/userfiles/files/35711271126.pdf
    • https://nhahangphongcanh.com/uploads/files/wumekameg.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed01a01ec2---jotaripu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0dbfejg8ga4ikma84frf5vrur6/jizewe.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf931d18370---80275631757.pdf
    • https://fentesmakina.com/paket/upload/files/kojukosiv.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f708d7df---15156454748.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97098015b---26433673707.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/8eea6d92e7435adf91aa4aa2136a2f97/remagajufulesosufese.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b6b8cc047ee5a8bb8ff2453c4b8fa17f/76633860480.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c339ad1a18---razupidaxaludu.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6032f25b---19265861480.pdf
    • https://eyetracking.pl/userfiles/file/xaluwarabofokerekom.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ts8q8vesjjtf6c8d78c0pprtnt/50403072427.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c9e57252f93ac408bbc84de843fb5dbf/besumexifit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
font_01_sfnt_off00013614.bin
2ebf2e497d0ca5b3440004fd84610f98e8e6e07eddc2c6e91b8ae8a6c51d0c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13614 16720 bytes
font_02_sfnt_off00016182.bin
bcfd055d7818d7248fd92e694872cd6fbb378ece6e9647c227661311ddc7fad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16182 10992 bytes

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