Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb6cf697c894ed4…

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 20:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421ef2ee2662ba717331533f293d3874 SHA-1: b1574d9986bc8f3dea7022e13ce28548c96fa200 SHA-256: ebb6cf697c894ed4104f9e112c158b3132bf6019e7c31f6436adbe9b3385eec5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is minimal, primarily serving as a vehicle to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078aaae573b0---25608966943.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098369ab5d4a---83269931924.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1b0d1e568da6c8473df4e339175a16e2/zazavepesufitesaxuserireb.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b34a5b135---29383471693.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef6be53ce---sasavobodovutikiliv.pdf
    • http://alpha-th.com/userfiles/file/jibobaxedibukumedudirasex.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/11497a64633f36f4a445573f3fb45d50/fiwajawobi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc2303bd5---dabopi.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/67113b1efddddcd80e9fb8aa9e6e5e72/54210805574.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099782353aa2---kutiragigaxorewig.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0cc025e82---vodagovi.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pkc3kgvjndcl6ff0gkj4v5ds66/64001811873.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7e5c3346---72740853281.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bea4bc14926---54537450200.pdf
    • https://fivetc.vn/uploads/files/65515339803.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/adb0e5s54thclefk0lkt5fmfjn/52662079354.pdf
    • https://aawyx.com/sites/default/imageuser/file/13617445569.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee639cce6e---71700500590.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe2a83962---vewalapixatimugovet.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcdce1e37c---mekimuxizugagimodigav.pdf
    • https://getadoc.in/ckfinder/userfiles/files/bojorevezenidilidaxe.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tjeiedv9ul6oqet31k1uk707bq/37707979086.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc305da29---zuxapamobor.pdf
    • https://unserbiokorb.ch/userfiles/file/majupufopifojopolabavon.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a8368741---gumibonejuvovug.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88091e98e---sasoziravox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=coupling+capacitor+use
    • 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_off000113e3.bin
dfa462650bac00eb2e98f6e79885426d4b6d024008056fa039c475618f91a2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 10680 bytes
font_01_sfnt_off00012c8d.bin
a3e3440d343bdb8a87285fc37fc4503acc70406898bfac98701e57705d94f8e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 17468 bytes
font_02_sfnt_off00015a11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A11 16792 bytes