Malicious PDF — malware analysis report

Static analysis result for SHA-256 59abc9facd9aee4d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 11:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2acd2386d1c9b67030b1b5465172f58d SHA-1: 126ef2c64a4a3b8889995d5759e58a050efc426a SHA-256: 59abc9facd9aee4d50c88edee357da0653d1282ddf9289e1dca9340fee3c609c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://circolosilverblufitnessclub.eu/userfiles/files/todenimewodajiditovagoxer.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be93887d464---51798725528.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/45961713186.pdfIn PDF document text
    • https://medtek.vn/storage/file/25112539361.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qdf8ikp1fqn5rej0tra3v7l0mv/zunederapalaxudajop.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/nadalebonudosovekugikabe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35jfa8uk5ijudktq4el1sa6r5g/45324783246.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/zudixapojefixaxisaroza.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d34d9d465d2512c0af7bc9cfa996cd04/wejoluwirupijaj.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/87366439462.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/103051412831c5db657b52869dec76fa/14439370337.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56564589770.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/37780585997.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/39005692965.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/ponekusojele.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rapaxizosipegovenunuri.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/ritefuluzibodifalaxulozi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d478e44da---68061854185.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b986b39b---89602571176.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/2176313268.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/da0363ed2e0d49e0955f6022d0b3f5b0/82780995175.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/96098746066.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/57426949801.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5850d5e3f---libawumum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fostering+terminally+ill+babiesPDF 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_off0000bcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10684 bytes
SHA-256: a8cafdfa90e177f5090f6644ec5a670b9fa8a565150119b0611907969096f23b
font_02_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 14836 bytes
SHA-256: 44040fb628b20ec6516ccb14ccccc4785f825648bf8802463b58bd22514646cc

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