Malicious PDF — malware analysis report

Static analysis result for SHA-256 074fb57aed51036f…

MALICIOUS

PDF

79.4 KB Created: 2021-10-08 06:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c3699097fb384f76488643e7a048ac8 SHA-1: 3327e5173888da52c3bf5e55116977df6fc18f13 SHA-256: 074fb57aed51036fbcdbf6498f454e4bf8639740758b4c44586e03aebd03fb38
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://laborke.ru/uplcv?utm_term=code+66+lords+mobile PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/59304322361.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613fef680123c---27958832481.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/palajisivoraja.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zedigodinatuwoluvevejeg.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/wopiwofakojawogatemoxo.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/57717707182.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/sutoju.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b782150fb---94152194991.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109161917598969.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373901e9fdf---55327137193.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/nebazovizejuzelakejubaje.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/83922920074.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/salok.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/zefegenipijelepafenomuja.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/7061078971.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/95528826562.pdfIn PDF document text
    • https://razredna-nastava.net/files/64951123901.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zafasugomobowugesijuve.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kvu40ft25kgtdn9jrb3qn3le8b/11797955164.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/titegixulow.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tapoker.pdfIn PDF document text
    • https://netpage.info/userfiles/file/gukanubosunepenet.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bojopekulolivesuxi.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/butasutokosetub.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4fioft0m6fkvhva7ne5dlcull/19532819824.pdfIn PDF document text
    • 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_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 22632 bytes
SHA-256: 30e6f41d6588916ed194179f6cd6637a6ef422355f6ead2345492622b222f680
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 10384 bytes
SHA-256: 971784f3aaaddcce5b89d904c1bd3620fabf85aecf2b6776cc534fc459243965