Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb366452853190cb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 11:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2867d64b287999ea5db176dbdec556ef SHA-1: 356709bd7dfa8e0a2539f316b274bd6f4f72ff9d SHA-256: cb366452853190cb0002b50c4545c0c6f8d4e546f26a42d715887cedb1a5d474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=signal+conditioning+and+recovery+pdf PDF link annotation
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087357824859---galuvixunukewogezefasan.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/bezawuzetotigado.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c4b851663d2b8f777d4ac78c0089e85/vovukodopux.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/83667689219.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mizitu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f509dfbbc4e2deebc878ec821e7e4b87/newarajiwenogixaxi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafcff3d8c---51641133733.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/06d2c018c7204f61c0ce695af32c7bc9/sukotixedumofasadijexizop.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/va95g56bvq4li7hubrp7s5bje1/99253838137.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/9254108401.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/2042451166.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/momatavo.pdfIn PDF document text
    • https://ever-progress.com/upload/files/sunazuwanejiv.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/varabopemofezazuroni.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/75307786468.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160864f85ae455---vevilu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d811a9742e6---28298169474.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/gelomumediraruzugolojos.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cb01c290---pidunadiniwuvavizu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/20911954273.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/68339749467.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/rasujozul.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/kogebujika.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/78762252819.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/goxawurizemifototubosefi.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_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 10884 bytes
SHA-256: bca6d847cf2d546e514fdfd0452cedc80d1be46a6cefb638fbf792daca83a7e8
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 17192 bytes
SHA-256: 31a5e9006ffffef399dbe697d17b6a8e3daab91d51347ccb76f87e64a06e8f1b
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1