Malicious PDF — malware analysis report

Static analysis result for SHA-256 23634de25934e29d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 16:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6863e3268a3bc217a72ee9a5c29f70b1 SHA-1: 0067f04f89a46c19b42de954e44213bd3dbc5612 SHA-256: 23634de25934e29d9e7c5376334fa089c9b205f15768f61f51659f94bba81251
156 Risk Score

Malware Insights

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

The PDF was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. These links likely serve as a link farm to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=celtic+woman+sheet+music+pdf PDF link annotation
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/757fd467cfda94e223fb5205b74dde7a/55829282595.pdfIn PDF document text
    • https://majubesar.com/contents//files/71846697458.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd6535160---fajovusiratuneteneweni.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/gonozubatog.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/r0bakfv0le1ob8pjdf4j03u5g0/lonanuwukofubefadubuwaz.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930011b2c02---zesegemifize.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/95562426310.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wajedowigejufatejutopeji.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0e578fd6443c9408a012a63ecd5a7afd/zevupatumobirebuweso.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/53523348327.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/93728331058.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/19320557159.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/91017678156.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/48756433675.pdfIn PDF document text
    • https://advik.net/userfiles/file/63044886591.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/38889142790.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16082264f4b43c---puzaz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vavevijegarunige.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wokokimitokixakunexe.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/10423316913.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0f88rt9mlcooa4gl3q0ujc19f6/sagewajogewilutirutevix.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/84776220946.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_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 11000 bytes
SHA-256: d130b6f947d96f6d56c8827bf50b74f24a83d1556d04d93f9704f4febbb4dd2d
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 17080 bytes
SHA-256: 87450164c5c2a89192f39ea62297bcb8414ab2f2fb943bfa0ad04ab43c88d518

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