Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efdd0f7b16e5b72…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 13:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33c5b68d4364fcad502f7fe69b223b9c SHA-1: 7514119df0512929063c12045e3954c45f72e448 SHA-256: 8efdd0f7b16e5b72d94205572dbb732be81f5e58e75a2c088cd37d032a72d87f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://snypes.nl/img/customer//files/26127250632.pdf In PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/21085043831.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/88336937028.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002aa281a8---titir.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c072c97874d---zujikunawuwe.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/86262382402.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/xadafisovuwixamizesenevi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181612522833.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ejj3j81o11af2d8h58oq2ba29u/77980796901.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/zobosetolulipujasajajak.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/wilakuwo.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/ruwiwudidofowoved.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/megesufumepikibatigasa.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/35049042345.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/xonadojudefef.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/19889743008.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/pininasebovowir.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/16206654379.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/badokivewidaderebe.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fa349c4618bd0d7b0864b61ebd09668a/wipelarumevu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1380e388d3---rozaveserigarugif.pdfIn PDF document text
    • http://nessium.net/userfiles/file/lumutimisatudu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d515e3a854365fb71e43f8dd8ec8cea/sujusarejapamovixolo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/42f05cf098c5af9441553f65fce11cd7/womazefujigafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ignition+system+in+automobile+engineering+pdfPDF 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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 11148 bytes
SHA-256: e323525fceb5e7a2ba6d1fe50ddd25356ffec4c2c237b61c8fe200b48500e786
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 16336 bytes
SHA-256: 240880a7304404ef1926031671e3d6bc7a05db1a545d9ec89f8d48c5f048a184
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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