Malicious PDF — malware analysis report

Static analysis result for SHA-256 6899c2dbceda027e…

MALICIOUS

PDF

74.4 KB Created: 2021-10-02 23:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac9b2a431ed75f51a589dca0d108d78a SHA-1: b5f61b4eed162f3edb1d2f7cc159b3c79062cd7f SHA-256: 6899c2dbceda027e5a5379fd45d048fc8580a564461a9ba86ff7124653981766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://crewmak.ru/uplcv?utm_term=steam+view+purchase+history PDF link annotation
    • http://sinostandards.net/upload/files/45526251535.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wafixab.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/80202891331.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jixalekifixupakaxanokuk.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161567a502f57e---mofomafev.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210909_034727.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161443a30a5b75---rulaxomabedofiwozudariba.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6904dcf1---79219907325.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/pelebixoromobubow.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/6605899959.pdfIn PDF document text
    • https://norservis.com/files/files/fanajaxep.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/50560006798.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/87158786966.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/72455521460.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/62878409255.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kexuwibidukelupes.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/xipikuru.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20211001025238.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/72045004808.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/vexadabatuz.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/30057250099.pdfIn PDF document text
    • http://allier-genealogie.org/File:/31297538921.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/95148421260.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/48036941962.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/zukuvanibu.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/91862692476.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_off0000b98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98C 10932 bytes
SHA-256: a7b5b39658c58f7cc926135dadd49897836a05dc74112ba69048e120f8844614
font_01_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 18828 bytes
SHA-256: 5f72d172824d234c3415b2814db5554e1e8c766435d14439c94236a3e81f5446

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