Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6545799239c314c…

MALICIOUS

PDF

191.5 KB Created: 2021-09-04 06:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f830fb6488d46c7e59fa9ddebc3559fc SHA-1: 0a8ef5f634661980d0cd2de10815ee01038df353 SHA-256: a6545799239c314cd54f7e5deb703eefd847f4b09693090da69e3cb23d3ed052
156 Risk Score

Malware Insights

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

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 URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=kranzle+k7+manual
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a839f6f3---15103599282.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998ec56f252---73541259314.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4c27dde96abc3872c339b59cc48d060d/rifigulefezujojilotizi.pdf
    • http://moyamoya.center/images/hand_uploaded/files/kufepitumekusu.pdf
    • http://aep-tc.com/cache/fck_files/file/79648584567.pdf
    • https://wsbtitan.com/images/file/lotifubosariz.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1ae178b4---25034250873.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/4992e11463c9dbc71daf395cc562b22b/bugosebovexisorome.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611be25eedbb0---sesased.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pavekutadajulazisipowebi.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/49e5506687de8cb5adf8fab8fd4c85b4/kebaga.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/likukuzop.pdf
    • http://kamnitikamini.si/upload/files/49364665116.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b67629f191ce9beb6f4350e2901224fd/8074464698.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/aa97akeelo9skn4hc1abtpebhl/99519498793.pdf
    • https://kanalprofi.at/UserFiles/file/danukuvefafor.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mn8fi2ek1220jl5p5kv0mc8ok3/dusoje.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/19288236189.pdf
    • https://weeb.nu/userfiles/file/lugafasitisoxazefowib.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b0a726e66da792b7508675fa4b3a93f9/dufomufemajukitafa.pdf
    • http://slsnn.ru/content/files/44897031923.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd1b1d0ef---13246245962.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbad36fbb---81068319303.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a129677845c38ffcf9f3d984991f3825/10280425144.pdf
    • 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_off00028abf.bin
3e24f6495b1c02d186acf6e4db54c8c50fd17b7a4260c2146fdc6aa4e8eeb0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x28ABF 20820 bytes
font_01_sfnt_off0002c079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C079 16792 bytes
font_02_sfnt_off0002d890.bin
e4c2a2bd9be3f4d14c3fef1213b43ff233c863d2f51e4e58ba3debbf20ec8ea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D890 10084 bytes