Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10a6ec2a9df7ed3…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 03:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 159ae4ca14cf34c41f977365e80384f7 SHA-1: 18ce4e47e0d3eb1f6d29b5dd7f1c9b3c8e54beb5 SHA-256: a10a6ec2a9df7ed3fad43d631ea9cf221005b1f64f4bf5a956ec835142bd9fac
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm designed to leverage compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lqg325v26415m22npn90mphch3/zunupulitomeniwumugexera.pdf In PDF document text
    • https://e-room.co/userfiles/file/tugosubujamipipudexa.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e482e7d7f4---27096599701.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/fezusanuxunivudewikebu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d174b78abc9e1239a0a6d52b846f86ba/65850036010.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4645bf4de39350554dc85b93730e9e9b/bavidojojisesibenobuv.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/bewunuredugujinonikum.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/sijeturebibexubetu.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/49792979975.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8da70899a---desasetoxabo.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/99125613430.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad0fe67a9---98655099151.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cnkuk6qb4180cr0mie8n6d9d28/3628612539.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7604df60e2302d0689c112fec62606f9/wowaraguv.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/43690164619.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/76b22284f20b41253728e37a0ea25990/ditabasa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4435543a---powapajasoj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jetikifak.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/fevebekaludezevezo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e8603b224a2---42459000741.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2581555ab14cde6a6bcd069a1cb48a6e/zedufodeboxexodasori.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/30a907bdb74dbe1d568be01ab4dca5cd/911928595.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac5c5eb1d---80718112154.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/jofelibefudunase.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3pcd93rhdgnjadug8p2sp3hi57/xunafewetoserawibopuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=richard+clayderman+mariage+d%27amour+piano+sheet+music+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 19404 bytes
SHA-256: c9c6c19b62502156669d6e24a967f7e2da34802bf4a22f33f812fe957651de56
font_01_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 11360 bytes
SHA-256: 42e1ac27733004777b4b84dba6ea3eb15e3b77a85858ff4ae4485fad2e681227