Malicious PDF — malware analysis report

Static analysis result for SHA-256 d285603859252cf7…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 21:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bf20d4c6934a321214b7dd8e4a295a4a SHA-1: b4e2b62d41f87c6ae525cf66a37fe811f7b5d092 SHA-256: d285603859252cf76b2dda7c3e1542c83307573e688297b48d3761ee346fe663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs are likely used to host phishing pages or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=teesside+magistrates+court PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850fa65d27---74620808164.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/97602927668.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f085ed0bdc---puzezavavefe.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/87423678662.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce8126ead---81481078901.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cgk4d7d2ihidcasq5rif9u1ld4/7550721369.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160736e81b5b23---legemowuxivetipevedalano.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad32ce3279---84963427419.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783fbacf800---fetenoziwak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f79fa5448---wizukedurijadij.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4bb42cfb---59279810587.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/224f14f201186eaa7f9bf0ba93428ce3/resusaxuzorijifodoxaliv.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04c33b43bee29bdcc8a32aa8193a97cf/75637322451.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/vovedivawu.pdfIn PDF document text
    • http://allycatering.com/userfiles/bupiwurebep.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/88095713507.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/71861846633.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/rofurifefazokirugati.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba66817964---jukuxawojazaxi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e6008a404e998ee7698322bfb72eaa02/xatofirenizetuzirawu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b87f18c2---jokakubitoverufujegipeveb.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fcd6f49cf9aebe9788c20fe443e73cc2/81128289957.pdfIn PDF document text
    • http://atek-ent.com/upload/file/20833111707.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b0066cc4---62276000636.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_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 18532 bytes
SHA-256: 1e7976fc0d85045900b57fb6d0c5302c4540243050dfd7a91ce0509226099f31
font_01_sfnt_off000133ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C03 10624 bytes
SHA-256: 709a8b3dbe786cc1a94702b8291f9cb381f99c30fb2088129ea3dfb676706327