Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8353e305c2465e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 22:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e493d0b8d57c4772860d37d7e7eca064 SHA-1: 44de454b9546e70192136667c6d87d5612093132 SHA-256: 9f8353e305c2465e458bcdad3934a7a2cb3d13471861e6d7ba8a77b4f336274f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab141fbc68b---tugojugagemixiwaxewer.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5beb8a628c---90509596622.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2qhqc9ngv9skvpdrsgmih7floe/xanipavufugir.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160803cf295eec---73699765340.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d8f46f6f---89964836543.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/41fcef6fb0c77fc116b79723940b122b/59754729131.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/53u4rmr0q6hcdqketnfctrcph2/rolupe.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d037e1ee---sisuludoguxufakogoxesel.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/05cd9c72a1292a2bedc526cca8e4b855/dufizape.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e218b05c96a6fd32790f025ff12bc58d/40717445382.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/322598052.pdf
    • http://www.mostenpo.jp/userfiles/files/40276341137.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ba34c37eb3fe0353b8378b566ae02c61/lebujorinevipowi.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64612a2e5---tugonufevagironoriguviw.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mhks79ujqvchh4v058ulqvsk4t/zovigabinekunojusota.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084190d21ce0---zitotuwivumojizisagu.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90142ada8f---47095362470.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3834d0590---65915680657.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b584d1dc68c---bexuwebubabizonujopevi.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/39ed561ca658097bd0e1880b4efc2932/luzelofiv.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2689d0ccb---lubipeluwomuz.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fa40e22ba---82487420396.pdf
    • http://m2m2design.com/userfiles/812456741.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e3e3f28190eae5916e54c5d2c9e0d79a/ravikenijasefawo.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/50702652395.pdf
    • https://kodcomputers.ro/2664/uploads/ragivukisesevonigugorum.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b254fac0bc---42957340279.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=watercress+in+water
    • 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_off0000fa18.bin
f2f337659ab9c3a3db0d7f00410269cc828e21703d1ef99cc532c4ea6ba5ffc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10136 bytes
font_01_sfnt_off000110ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16792 bytes
font_02_sfnt_off000128fe.bin
504fff2b839651487104210f4ba1e2a35101a7a2a2c37123d0b8e0153c7dd9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 16228 bytes