Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc6d47dd6651825…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 23:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24b25e332e14cdb9e6554251db328417 SHA-1: 10bb2a86087d8fec65b063dc978f5ad1eb0de006 SHA-256: 8cc6d47dd665182559bfc729adeda7fc67c0982adc6dd883200a27880ef02aea
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary attack pattern involves luring users to external sites via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://laser-piskovani.cz/democms/userfiles/file/95767268212.pdf In PDF document text
    • https://oncetrabzon.com/resimler/files/xonowulobokidubinumo.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wuvig.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/97259180102.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/39266865255.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/ruvirexiredutiwafuker.pdfIn PDF document text
    • https://samudra99.com/contents//files/ragiwokowaxewemesex.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cadc3de68c3ba940a6e244a400b2500d/komininuki.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161379fddcb7ee---vakevipiwumogef.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/19495357553.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/gofub.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/jelemeniponadabinejuj.pdfIn PDF document text
    • http://beateromer.com/bilder/file/pedirete.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b746e9720---55189115520.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/11354247566.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021813232116777.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bdeb3f27---28485465214.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba880bc2c77---fulunufu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/93e4b72c9e59c42036f660536c568a83/fibadelefidowaka.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/xokedunatetek.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b473f7e8cc1---78501940465.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/32217999608.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hd7tvi3cgi42mm25ftefg03kgr/waginajotij.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/58639868947.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcaf19243d---54977537093.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bee94b5f6---27728793928.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66cf1235---2397243129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=calculus+chain+rule+practice+worksheetPDF 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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 10780 bytes
SHA-256: 4c421cc529b2d7c92df71321a8419e0f53004bf4f07b22ad3dfb9598ad07129c
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 19808 bytes
SHA-256: 82dd58429777c4b35e067d44ad3d0dbcad565c102d49a08cf95db324e8abdcc5
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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