Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc10d2d89565d360…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 16:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ae50e9bd5f0d2b089212b80dfab54d3 SHA-1: 7e4965cd41825d9dd79ff375259c22a2ae91ae0a SHA-256: fc10d2d89565d3603fd048ac5bb4b28e9e90beb70a2e9c4ab8d3dc13b2706d06
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the presence of multiple external URIs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=joomla+mpdf+library PDF link annotation
    • http://ustunongel.com/image/files/62381752968.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210820_E1BC78594AC785B3.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/beloza.pdfIn PDF document text
    • http://navigator-33.ru/media/file/98792235316.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/24906427694.pdfIn PDF document text
    • http://healthywithhart.com/res/file/35405281369.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16126c9d59c3a6---giratisozasowinunobijo.pdfIn PDF document text
    • http://rem-proekt.com/f/file/tenoforog.pdfIn PDF document text
    • https://ntc-container.com/upload/files/mosonex.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/30ea9a6c5da4983996407b34ec5485dc/63066764695.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1148b68cf1d8855a99e3fbba601c9d2e/tesumuvikagonoroxowujewo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nadolekakapavu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ettpt3nnd015v65aoavs833h1g/xujizaga.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/58356548280.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96af10f96---turikejiziremanafagako.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a6b42e63---takesap.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/detotuxoxovoj.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/dagemireri.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/gawonedajaxiserivukulomo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71107d41f---49057338560.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/76587858127.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/janufukiromef.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/vigisudoxirop.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9c623a9a---voxobiragizabupasesub.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k9i5maugjbnogkk43pltp6tp67/nitonarozekatilorifota.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/sumisuxowikobinefijudis.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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 10404 bytes
SHA-256: e191ece88501951575fbc45827c7daa16c25f2918290844e57c3bae5bd8da119
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 20000 bytes
SHA-256: fe8bf65984141a8e24808a11056862d90fa421d548f5a1966aa765d56a80cada

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