Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcdaa633fdca5e3…

MALICIOUS

PDF

90.3 KB Created: 2021-09-03 13:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4a215d8e2771218718b4190115d1450 SHA-1: e0d5c863334dba3adf11432c83894982ccadc781 SHA-256: fbcdaa633fdca5e329740e1a6aa31e4f4ef61bbca028b131d58758bb954c496d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious links. While no scripts were explicitly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=impact+factor+journals+list+pdf PDF link annotation
    • http://ues-rb.ru/themes/ues-rb.ru/files/gukekekatolifabe.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/nanagawizogovep.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca51b867a---15766928209.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/wisizavutego.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/83815236396.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb36d83d1---40860421412.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec52a74f26---15411124169.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/3895526988.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/talisoxinonozumi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac470ec5c40---nomodesulupematirigovodev.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a636d51f0a6---sozovevo.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/49825344919.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e102f1fe3---famiguguvijefow.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fital.pdfIn PDF document text
    • https://carlojans.com/cms/file/17491648187.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/dedisixakiped.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l73c8d5tsdgt80nsg1niuo0gs5/3511520210.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/letedozabomasavotur.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210831080433.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/lubajobele.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ou8527opuahuuiq0hp480dk56/34780400531.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8e15c058b---9081213672.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/bajubadilibogewiwafakono.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/83846237174.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_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10832 bytes
SHA-256: 2b429064cecce70a27a669cc504134dab4b747baa44a8227b4491517bd7f548e
font_01_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 17984 bytes
SHA-256: 2018221b354171b10da6733e088068410f1b1661d76e33eb264ec2bd9c391b46
font_02_sfnt_off000143ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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