Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf04627e735522c…

MALICIOUS

PDF

102.3 KB Created: 2021-07-13 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 461caa9b0760326e82b80a2daaf5e8c6 SHA-1: 6cf1ee0376872f726b9bbec0779fae4c360e1cbd SHA-256: 5cf04627e735522cbb7dda5c238b57b5f724142b77feefceb124a213b8c15339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://eperon-kochersberg.com/img_db/49302442599.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afca65251ce---31403593393.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d2b32433---97316799509.pdf
    • http://hncastlecable.com/d/files/wetupewokono.pdf
    • https://balustrady-metalik.pl/files/sekurusarisosuluke.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2qm26mp366scm3d447poovam0/navumurisef.pdf
    • https://advantagelic.com/singhania/downloads/file/bopabem.pdf
    • http://dailitara.lt/bites/uploads/file/visitanabovojufarakesuvaf.pdf
    • http://agro-vostok.ru/userfiles/file/makiwew.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e09a65ef---90543447445.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/170f104b6dda121d73988e3375a3c1f5/60820515869.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/28781020972.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/375c275f89d716463a700e674fd169a8/87678980461.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k3s1l8aje36017bcrv7a4sg4d3/10318941202.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160caa389e778c---30447964355.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/41105830198.pdf
    • http://meble-tk.pl/userfiles/file/bodekatunemijesewij.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b429595b---koruduwuzimegobi.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/sq1opf55pef3h8oo4ceot1rsc2/wikifisafoxewasupofe.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ukdcccvtts7hq6e498v2bou7nr/didit.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e682eab63b0---35924881131.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8b77acf8---natumejonisefitovirulefom.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/618e7bdcf33a995db971a0e0e24dced3/65585062459.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/pogamamawiwibe.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e910b4c1d1---fosubiladuzumovexaxoxar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=saber+tooth+tiger+facts
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a4.bin
6e5e67954f79e278760037dfc362df6c8673d3eecad6b7b8f4ddd36f8a687648
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 10680 bytes
font_01_sfnt_off00013043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 16792 bytes
font_02_sfnt_off00014854.bin
09562ca2d5000ae2f2345c4ffb282664df80e6add20478162cc85c395b82892d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14854 16120 bytes
font_03_sfnt_off00015da8.bin
dfe71e632ad5c3b4bd873e3081726f4f2f15e00c42a73953a292fb9717cc2c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA8 17648 bytes