Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0ff4ecc8edf609…

MALICIOUS

PDF

74.9 KB Created: 2021-08-28 06:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c486be3923843b25fc0a365ff5c0a2a SHA-1: 66d85b4ec09fc0faa7dcb99da21645934d6a4e22 SHA-256: 3b0ff4ecc8edf609f2a72e3281ba3504e2a5b24cffae8f9a7cbcaf4723d79eed
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristics indicate the document is structured as a link farm, potentially to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ceomit.com/fckupload/file/vefinenizadejudofakuj.pdf In PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/39167287738.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/81911362612.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/42189796109.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/i4cutub3nja0htbri0cn6veqs5/kijiwutodarejekubozo.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/47031823348.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/81054064812.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f478c3f6d---96187245832.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/miredoberaxinimugozewak.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kujorozegug.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lfcm39lp7q7uor6nooo0u7acpt/38427280035.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/zalugeboluwizafej.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/65982021798.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4cc67d9e7---62769147703.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/23496351564.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/22269368625.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/diwowudigikisajudokutofib.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9dc63ef2---57045841674.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/potifesujaluzusagil.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fk2vtea7p13b323ctfbdudr02b/54396402079.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/99965029285.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9a0acc89809ec37ce4673d4b3960cdd1/63958210027.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/94531124567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=neo+classical+theory+of+entrepreneurshipPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/81872738932.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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 10768 bytes
SHA-256: 32182d02c90e2ba4344411bcd4e3df27e0e3df60e17c55ff85e51db81948de73
font_02_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16176 bytes
SHA-256: 19f422591290afb6240152fb805e75275e01284d5f89aade33357e7f0e65cbff