Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdbdaab44a686b7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 18:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1309256aadeb7b2cba7476bf6b1942d1 SHA-1: d6f5a40cff69be057b37e2ff2bbd771713c3c378 SHA-256: 6bdbdaab44a686b717a4b0c3985e5e18cc225bb6c9355abc1855019467f7d457
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://12shio3.com/contents//files/naziso.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/prrdbtlnt6vpbr0b5ppr1ul9b1/16590638460.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/52e917ae7630925c0fbc535218ad0b83/81104628268.pdfIn PDF document text
    • http://camonetinternational.com/files/file/dunevowus.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/10673897631.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/rugulidiri.pdfIn PDF document text
    • http://esistore.be/userfiles/file/65131504670.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/29510116014.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/sabavixubu.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/95463120153.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc91cad7678---10672268910.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b514904877aa25576f96aab5b166b87a/69501334394.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7748052469.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/karunuxonurawol.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160949c348254e---73150887776.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/17414076631.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/3552748697.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/87658488232.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/dewupeje.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/rerewufedipamuravujowexi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608978942fb82---94964845669.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2898bb3ee---zomabufipaz.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/gomuvoto.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750c0c3fc65---gezesipoduzojunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spay+and+neuter+clinic+crandallPDF link annotation
    • 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_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 17148 bytes
SHA-256: a9d814bfd757f7e693db3f84c0024080cf5cbc655ab21985f268f918c9ece93b
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 10508 bytes
SHA-256: 3786b0016146defc03b67190a6d83f341fe8861659367660762dcd6937784f98

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