Malicious PDF — malware analysis report

Static analysis result for SHA-256 0452bb01bed6eaac…

MALICIOUS

PDF

75.0 KB Created: 2021-06-25 15:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ac0d715bcd375448d60692e05aab81ea SHA-1: 1246dcd2755a915761f12c033cda1d9fcfcf8d2c SHA-256: 0452bb01bed6eaacd82991f307c1ac7b98aeba8029baf14643fb13780883c44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress installations, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8271b8f203e11390eb3959ee1280beff/92655247049.pdf In PDF document text
    • http://progfin.pl/userfiles/file/87258576734.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc98ae58e---77017523283.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ebbb17315e0261b3a2497ad1a565e979/jofijeberelidup.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/xobojupaledig.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/lelofumefekejikenimemerow.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d3c439df---lenuzaxebelowu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b778c33199e---38331222797.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/75780127805.pdfIn PDF document text
    • http://mousike.it/img_ins/files/43710758948.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91154e2c0---16182769249.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93ebf0a47---61222367938.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/85820517926.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609693a46e216---17289076260.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/33886771543.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/3472618d5115564bbf26a617cb83bc4d/judigofadamopur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=squeeze+theorem+examplesPDF 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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 10804 bytes
SHA-256: 2daa42b9a303fed52549546c84b33a2dc0129cf7e72e1eebd0dd322a682f7a36
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 17592 bytes
SHA-256: 58fa4b548abac5c918b30381d7b15f4cc7696a27e015442d7fbdb11ba6e34558
font_02_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1