Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc0a97c1ef2c683…

MALICIOUS

PDF

104.1 KB Created: 2021-07-29 20:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a317d4d15f04c7714219deed48fc3cec SHA-1: 8fe96d7f9327c3566be750aabb5a33f16082c045 SHA-256: 6bc0a97c1ef2c6838f6dcc272557a34c974e505f2b6213d573fa1ffebc212de5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2957

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=diamond+skin+microdermabrasion+machine+instructions
    • https://discovery99.com/userfiles/file/motofazafudajabarofi.pdf
    • https://landatur.com/files/galeria/files/jujosa.pdf
    • https://audreyheselmans.com/_files/file/kuzezal.pdf
    • http://goodtraefarm.com/ckupload/files/33771588805.pdf
    • https://jagamimpi.info/contents//files/41576505607.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/844e56e5772a14c65544b2c3655b7413/gawovufof.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27e60eef4---tedabenole.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/gomazovikozofarujur.pdf
    • http://champagne-marc-chauvet.com/images/files/62056502858.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/55728536759.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/komaruxifidatemamem.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/29421205340.pdf
    • https://blogsma.com/files/nukogovezijorovox.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f7fd39f4---21851683511.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2n234o0konnrbiet596aq3vj31/jusaxipexepigogotuk.pdf
    • http://wanyuantemple.tw/userfiles/file/6380783732.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfe11da45a---lavonilofinoluwelebir.pdf
    • https://marathonroller.com/userfiles/files/44680368887.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b0771345---voliw.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/0c0453ba70af39ad9d1a37a2b5643d7b/22670044556.pdf
    • http://tokstar.com/_UploadFile/Images/file/lisite.pdf
    • http://bigredclassof1960.com/clients/879476/File/40919319330.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92172797e---bovodepozepomewarutozajer.pdf
    • http://digemnd.com/UserFiles/file/kawudazedituwiwusep.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b86.bin
9f7cb90ece67ac3351edb005c1d29ffde5346de429d3735acb6335408a096aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B86 10924 bytes
font_01_sfnt_off000164a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164A6 16792 bytes

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