Malicious PDF — malware analysis report

Static analysis result for SHA-256 566b5c5196ff4823…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 21:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77bb503e9a733d0aa771151296dd5477 SHA-1: 25cc034ceac0e09118bce6656dddcf63b6dfd177 SHA-256: 566b5c5196ff4823bd51edae87e96ab0348218426249f1d921384f1fab7bfa14
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or redirection scheme. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a phone number, consistent with phishing or tech-support scams. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://medvor.ru/uplcv?utm_term=novena+to+st+ignatius+of+loyola PDF link annotation
    • http://pnlestari.com/visitbali/image/files/wenusuvir.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e7fee1853fce821061b645255274cee1/zuvojujaxevobir.pdfIn PDF document text
    • http://zae.me/datafiles/file/mepejapidubukodetexisivos.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/85727953009.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a133cf5b---gitojudapatixotawazov.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/bumuf.pdfIn PDF document text
    • http://0048.pl/48files/file/14354214117.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/80728508126.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613736683aed9---jonurixobatof.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/61194453384.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/roraloxowopab.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/vudojasozalalonajedumi.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/pizexugovozejolixitiwigis.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/tajetefel.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/75972657705.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30084765733.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/152041517793.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/jakitilal.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/rinorapa.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/vamobak.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/20074493427.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/xigosulutatu.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xawapifunenabu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613398a34d714---janetibixoxekusaxipivex.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gozubagemulisele.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/xusitotatafafilabuju.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_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 10548 bytes
SHA-256: 8db291367fa61345abaa8070c1d675cc25c50d0cc262571d4551e3d860013ed9
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 16640 bytes
SHA-256: 85caf7eb482e7ffea48a0bd5d7104ec31274841fed2b21f0b460f5de829dfb05

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