Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e4eca41e91bf3b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 05:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29c994c6582c294ad7ae1515eb9eba98 SHA-1: 4227832bb96824fd200d8689a39945cfe5577196 SHA-256: e4e4eca41e91bf3b1663979727d8f58bc88be49cc71f84caeb16d66ba843390e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7209

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://inwebjor.ru/uplcv?utm_term=coffee+and+anxiety PDF link annotation
    • https://digireg.gr/upload/favematezezepujen.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/waxeropujapawe.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bb47f53277683e48febecb8fd10fe0bd/17551691618.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/kobidobovuxim.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a923076ae8b---87858576677.pdfIn PDF document text
    • http://babamoleskine.com/files/file/fedoritize.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b7e86d6e---ketatasawodala.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92387785040.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wudegol.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/83604052985.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210730201339.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108210106512650.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d091e7943---nuzefuzewuberawopabo.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/74055080846.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/312e1f53252bad6c678c9834c637f808/4336575453.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/36124053068.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/9066136417.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/22497133550.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/damoresesobamixebuxijis.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/35159944215.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/4878460672.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/14599753495.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f77d0082b70---wetexinibopabi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad117ebf4fb---mawaxezazubafa.pdfIn 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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 17504 bytes
SHA-256: de9b05ba164633956ab5d534b85add2bf2ad8da011ef52ac8e03dd786949e28b
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 10280 bytes
SHA-256: f28567b28b2db67cc233e37e33f21e2801151d527ffc71c2c2c0428a38ab5656
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1