Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80b155f93fe97b8…

MALICIOUS

PDF

88.2 KB Created: 2021-06-25 20:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1721390c6ce2c51da84c82191a21b56a SHA-1: 973a80191c9bd9a697db3ec93cbc6a15c832918b SHA-256: b80b155f93fe97b867900423ca359ece0ad7aa798f096b662b183de51caf3536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=my+heart%27s+a+stereo+meaning
    • http://scan3dsaigon.com/upload/files/74244996543.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/89hb63eppov35llshj19roqcps/18796561281.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0e9390a8---61386817676.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/585f4bd41455f7b596a6b0e68eacffd7/98395992215.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742690cb9bf---rebotoganonid.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/a6ic4n6d50qe8n747n0netgm77/95591765188.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbee0767f---vigumonelezulekoweb.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d797048e50c1272f16a0ce2b626147f1/42837902790.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02164329e---tiramipezegari.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ad3b154d---8919331466.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b38e2c0f---dibexasamapokesipo.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160750134acb22---xejasete.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f28e496a---jogatirewidopizok.pdf
    • http://afghansolar.com/userfiles/file/62832510957.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c16fb334acaf7459e414d98fd441544b/rurenit.pdf
    • https://airshow-bg.com/file/20048386284.pdf
    • http://amadpich.com/userfiles/file/11556309553.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/4569267412.pdf
    • http://allamericannursing.com/userfiles/file/78665750626.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/71690141619.pdf
    • http://arniestribu.com/campannas/file/69922621365.pdf
    • http://mppscstudy.com/admin/usercontent/file/27534304890.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d254a15cee---80120132648.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed42214561---loguvepuzobabofotedije.pdf
    • 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_off0000f433.bin
656beab41610836c78c52df5b6934957be2ed9db9fbe537af0653fee2545184a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 18012 bytes
font_01_sfnt_off000123a5.bin
a6610499d542f7f8580e8c6c4ca1199051323cfb6762538016daa14d525a63d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 10652 bytes
font_02_sfnt_off00013bf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 16792 bytes