Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ac5196a672bf09…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 18:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1aacbc2dd80076611df7c15760e38a2 SHA-1: ca92815688c32bc726383040a8ab5a7e262f48b4 SHA-256: c5ac5196a672bf095641006ae1b0cfcb23927bb06240ea27cddb861678963fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm heuristics, suggesting it's designed to redirect users to compromised websites. The presence of multiple links on disposable hosting and compromised CMS uploads further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=finding+area+of+geometric+shapes+worksheets PDF link annotation
    • https://vishalahospitality.com/ckfinder/userfiles/files/79772794366.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/pajafogufitidulesuluz.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/napifopajuw.pdfIn PDF document text
    • https://menu2uplus.com/images/file/11569906791.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rimipifa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7358167fc1---90523383853.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49d7c8d74273f8415536da72699cf914/befof.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/tivimozabuzasepotegisasos.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/34125084937.pdfIn PDF document text
    • http://taxfreepoint.com/file/wematadujorumavef.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b8388c99ecc5fd67ccd047ed57af0914/wupujirer.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbe1e27c8---92464090490.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/8740933171.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/61623586285.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/dexoxofimetigawi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/8odroolnbdslosep8s6tas4uoi/14595090426.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/taxogogisoberigivomif.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/53634859973.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16128c3bf569a6---ligimobuwatasofifel.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/mevawif.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/if7d7og9c5375uaeqhrg7o3r92/mirutefomekajejimuzila.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/tososuvalabojipujolafan.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 11176 bytes
SHA-256: 4d831598cc29160304217b973a8e23435b52eb78036a1c03f8b92478c7610088
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 18612 bytes
SHA-256: 913a0566332b81eb95986ed68c62da237ae993af00520114816ec9ea1fedaa65
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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