Malicious PDF — malware analysis report

Static analysis result for SHA-256 be75764b2aa71ca2…

MALICIOUS

PDF

78.2 KB Created: 2021-07-13 07:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1947cd90dc3a880fbec8eab7e79eb96 SHA-1: 974423ed867ea0a1058c67c87f60a66e02bf61cd SHA-256: be75764b2aa71ca273dd5c8091ec91981f9e5ccfd4e08fa7e986297616114574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution lure. The file's structure and URL patterns suggest it's designed to lead users to malicious content hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gahi1d8o6fspajo5e1h1g33800/10873732747.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bcca9459b93---37553577355.pdf
    • https://unique-u.biz/images/uploads/file/bazaxuteseruximegarukug.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/50774942005.pdf
    • http://nuovartea.eu/userfiles/files/modaf.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5e744b0f---13901271525.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930ffc9e245---30050430007.pdf
    • https://prosperitas.be/data/assets/file/wudivitaniwerowomipono.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210610_0B53BEB7B2A82CC2.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160810efd4b584---masigaritavorivatobu.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160896dc1266ba---vusikipanekorozulixaj.pdf
    • http://10glazsikeyrosa.ru/file/85206869609.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c57d09129ad2a7f20767ecfb8b301108/rufudof.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4kovu7p7f9ld24enidj7hu8h6i/vorukuzokoxav.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8539bdf1631b8d88767253b0a24a06a8/zomedakimewe.pdf
    • https://karinbentum.nl/uploads/file/60345537289.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/20248993564.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/nugamuviwonefigofoliv.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87102b31425489c25d3a7fcdf617e487/5061688916.pdf
    • https://bacninhonline.com/webroot/img/files/tinidipatekoporufidub.pdf
    • http://toyotarentcar.net/FileData/ckfinder/files/20210626_2C2A088442352D93.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/67974078346.pdf
    • https://naoshima-habitant.com/14883908484.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dcbf5e2a7---misazovibaruwavipakubizuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+types+of+graphic+design
    • 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_off0000cf58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 16792 bytes
font_01_sfnt_off0000e76a.bin
2f29f4dc7f0744ae9897ce72ac468cb881f66997910a9d151ad63600f472fd4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 16300 bytes
font_02_sfnt_off0001118c.bin
72db5b1de270bb7a39dfddaf436d8509c9815e77d0935a777530806bc22009c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 11212 bytes