Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a212979ded680e…

MALICIOUS

PDF

77.7 KB Created: 2021-06-25 20:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9db91f4af4501b92155c8586d948b36 SHA-1: 7d1d51d07e0ec1d95f8c835b544408f164b72374 SHA-256: b3a212979ded680e77d2c32fa35227b425b6009eb4200d72d094fc407afc303f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, with several hosted on compromised WordPress upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://habibitours.com/ckfinder/userfiles/files/74733444643.pdf
    • http://olgapolyakova.com/files/files/badivodavegotaxuxedudidor.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f724983f32---93414946228.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3a3a9884---11950222580.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2192a8d11f4ee833018a6994c583a843/sinuwajugazimilesirevorul.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/xuxirukidotiram.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7ed68983241b5c187cb84660cdba3ae/zeroliturorezufilotagoke.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/82d78505fb6f52b5abcd9a36687e8a41/81462084486.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c42298ceccd---64547100905.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/38mbbi9ha1rt61t1l117i7bv22/10108808672.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mepafe.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/tejaxaxiwajaw.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34425d46f---97923018302.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ce3013471f6d475066eb2cabddb28908/gurorezivivelopax.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe1180f29---kujopadokaburitabebuj.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210616_153A66DD4D5AE6C8.pdf
    • http://emurus.jp/userfiles/file/raruk.pdf
    • http://alphasigmaoverseas.com/userfiles/file/87553100044.pdf
    • http://chono.mn/uploads/userfiles/files/bewiwakenujis.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160850440d1a6d---rutukogoximisoragazasaxal.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/25361867923.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=new+years+party
    • 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_off0000cdae.bin
b9c8e8a04ebb1e78183a9965b1f7af2bbea6418c79fa89a157ce2ba3689a3858
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 17744 bytes
font_01_sfnt_off0000fb4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 16792 bytes
font_02_sfnt_off00011366.bin
cdea7113d237b806f369756e232fd39bce8f6748274de9292576d604b1bdacd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 10060 bytes