Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ec661fa96dc3e0…

MALICIOUS

PDF

128.9 KB Created: 2021-07-13 17:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9150112876226b6a903350b1dad24b4b SHA-1: d17cd25acaf69301dcc4e7e0c99199fcbe625220 SHA-256: 93ec661fa96dc3e0fdba1d94d2aa0f09e6c7eb221cd877ffda74a8b934c521a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing and trojan payload. The document contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malware via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/081540b062b2aded9e30bea27c5e490f/53265117964.pdf
    • http://wamer.org/userfiles/file/silagimosodatoxumu.pdf
    • http://etasystem.net/userfiles/files/zajobenazesimafezez.pdf
    • http://riskhedgetech.com/uploaded/file/102290006560aed7cec8c75.pdf
    • http://thunderstar.cn/userfiles/file/20210506133116806396726.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f2379d9f---13511174432.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8779708dfbe51df837493d54db8c46ae/birukununawenusudakux.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f2f8a8275---66158925370.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ac39cc39.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/6708u4d2ve47tf9mikol7nbn8r/tipafut.pdf
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/47631877896.pdf
    • https://soechi.id/userfiles/file/65758395777.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/35261102600.pdf
    • http://cakenepal.com/userfiles/file/83954337999.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f742242fe38b49f9323259296c16a444/moruzes.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609821a952611---mikedujozosas.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b84fd91ec---17719377200.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b7ffdec52518f4183f72d331f1d2c7f2/61251436849.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2815812ca209fe64be02c80d91385479/razaxegajimibuf.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/89336688a2b347a32a91c82e038a2f10/84347844473.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/aef5e1c0933e301c52bae6fea4b66796/75538718302.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=proof+of+the+devil
    • 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_off000193c7.bin
32dc3f7b246a91b84dcb11807e4d0d4d0eaf2ff9a39c72a4cf6d46ed49f24997
pdf-font-stream PDF embedded font (sfnt) at offset 0x193C7 19396 bytes
font_01_sfnt_off0001c657.bin
bd175632f5814c130f133adc7cc559ace07f9f06e34ab978c401a80c4fae0553
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C657 10084 bytes
font_02_sfnt_off0001dcec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCEC 16792 bytes