Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2982c2113aa482…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 20:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f8a5433a548eb75dd19255fc2e9490e SHA-1: 925c139f70c5a502aa0ff6a030833380cbdbf4f5 SHA-256: 7b2982c2113aa48237b86ae299017f914bd48f5fab1b40e9a78c4bbd5ca55f38
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a distribution mechanism for malicious content. The presence of a callback lure heuristic further supports a phishing attack pattern, aiming to trick users into initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=ott+iptv+shqip PDF link annotation
    • http://elfast.ru/userfiles/file/89932217306.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/37164463640.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c01fe3bd3---wazavazurex.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/28932425541.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/pukakiwekaweb.pdfIn PDF document text
    • http://balone.net/_upload/file///gulalipilibo.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/ziwevuganinuxozonaxubexe.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/80746069447.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/61839963910.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/rupivuxunovagunuta.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/kabowubarurozi.pdfIn PDF document text
    • https://shinaltd.ru/images/file/pewebefodifita.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109010855435099.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/18492100837.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/retoxodedoz.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/56961554821.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/pelokugubikokewefotal.pdfIn PDF document text
    • http://3q1p.com/upload/file/210903234546197002fvdt0jfcwvdz.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/85435400986.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161353e3fb07b8---negusudepasipawisulutexif.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/ladijojexoxobakasite.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bexunedusakapenekafofod.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1026a4f03---zuparosuda.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_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 16804 bytes
SHA-256: 915d86b3a12e24623a727e0d69b78da27659232d9bbf588d83532e2458ce39ef
font_02_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 9924 bytes
SHA-256: 5b046472f1ceb3fbf8ac123115c2aa1748762017e0fa183ad5927f941e2fa788

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