Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d142491d85687d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 22:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54841db30f253df4f6d45d78065a9e5c SHA-1: 0e7943e949894884de5a1703a0011d9d5e6c53a6 SHA-256: c9d142491d85687d16585da102bf7877413415f025c4589f56d04cf71c091ae0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of external URIs and link farms suggests an attempt to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://habibitours.com/ckfinder/userfiles/files/govegazinavo.pdf
    • https://towa-aaa.jp/userfiles/file/lumizulitukasexusonuke.pdf
    • http://interno-kazan.ru/upload/files/60933365717.pdf
    • https://paklya.su/design/img/upload/file/48258030171.pdf
    • http://apexnepaltravel.com/userfiles/file/60595025929.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074f81b2da1c---11914167349.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/3rcs4tjmkodku5oqneipknu7tp/batir.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/833b8b564ff6d8b6ec756e71b519b3c4/numotibiraposikebalite.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e935f5a524b---vagobavag.pdf
    • http://smflow.in/admin/uploads/file/pifejujagarulez.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2103f514abaf4269c6c1f885bb694aea/83704626739.pdf
    • http://amuseonline.com/absite/userfiles/file/58197553101.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f505c1b9158a22c86649382f80b08e5c/xuboviroxotoxuferolaf.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/7ui091eaqju6lskg8projoots0/tosokojiwudafife.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bcb14e1cb6a6041e4e8985aa0940d499/57783467317.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/57f20bc7225497f4f75f6b10d67e6de0/22412085588.pdf
    • https://nibrasimansch.com/userfiles/files/liduwanu.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qh5p944dr0enj5e737cpqg7am3/3854803898.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/56941922028.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1baf69d6a8---pawovod.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/209b81a79ea86e41e021e708977c86dc/74249899013.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73356e4fb---lumowuxafinosuw.pdf
    • http://tsg-edinstvo.ru/userfiles/file/95180947466.pdf
    • http://efuegypt.org/userfiles/file/25409751590.pdf
    • https://isleo.com/i_photos/file/41034660821.pdf
    • http://naturallabs.de/userfiles/file/xexeluguselowibekosaxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=addition+of+hcn+to+carbonyl+compounds
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16792 bytes
font_01_sfnt_off000100c3.bin
b2982b979e7cb32deede5f415a1d6a2dd36ae41244ad28215dbd856ad6c522b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 18188 bytes
font_02_sfnt_off000130f1.bin
33502dd61f7b291cb2bf5b73a713d2ae097c379ed5b8dcfbcd3ed9b2a301302b
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 11088 bytes