Malicious PDF — malware analysis report

Static analysis result for SHA-256 843c2323b7370283…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 20:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 581a6003039f39d6bcac351e0ae49655 SHA-1: b935f9ebb10fdd2a18d942070ae76cf9f2e7f3d9 SHA-256: 843c2323b7370283275e9c3909c768223143622a967a20f8eefa23736566de0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=live+football+tv+streaming+hd+online PDF link annotation
    • http://cdkuys.handysociality.com/upload/files/vupopomusosedini.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/25153922456.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/bediben.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/89685673891.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/jijekalenipixopovufonu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/93364665326.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/luwobevomek.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e4af1291d174553d74dd34b4991d4900/sowejali.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5777ed4a899060e902212a262ea3e7f2/78055237483.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/nenemixokivofok.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/gukagatasirawalusa.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/voberepuvuseg.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/dibij.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/614feaeb69bd5.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140c01281320---33090111844.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/rupowexofijubifutagizapap.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/89482212493.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/repafixipol.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/44991782601.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109271711383473.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/20827477470.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5279bcfe7f1749b98ed6ad62e6866990/raxusewebu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fbd36ad17---gajimuxumodizefinulilasak.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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 10964 bytes
SHA-256: e904da84e705c0b6ce63fe2571dd452cc12aa0183092bbcd5a8b6ccc75fda6f1
font_01_sfnt_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 17456 bytes
SHA-256: 043f4b551a537d4a8d528881ddb299706f038cf7c3d30d3662497ce64d9e9fdd
font_02_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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