Malicious PDF — malware analysis report

Static analysis result for SHA-256 31190c73138f98d2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 13:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 607e9363fe3675cdf8a659b743e239a3 SHA-1: 871bf7a21798ec372c24a5a72043cf66beb1faa4 SHA-256: 31190c73138f98d2c29f4832ac498d9342665a4298a74ca50fc081cd9876aced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=media+salmonella+shigella+agar+pdf PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/bikifepolonexixutumufare.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/52711877067.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zuxusivijirig.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/21917158043.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e30919fb5---powawogagukemiwegi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9d304cd2---mafogowesexujotaw.pdfIn PDF document text
    • http://rayanchem.com/d/files/13370888327.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/dubenevudogunov.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/xotubudexakazojedi.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/66188890255.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/11953382162.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/31247799134.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/17471792941.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/36187423787.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/77280677283.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/83648007063.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sb3a5kujjqugaml9q98b36mpda/fidelumulubiziwitot.pdfIn PDF document text
    • https://somogyplusz.hu/files/popobawunerafanifokuka.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/61933265991.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6df4acc6---kezuwevedarexabofepiriwi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/26237800797.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/dudevefunegavomidubixakev.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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10840 bytes
SHA-256: f57b164054305bf88d1ae1344316c543c728f1a3195347c6d88916c81fe02dc4
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 17676 bytes
SHA-256: 97641efd41de475009a219d1a7cb70aaa7a9492aeb4b51d7f1e56e0297e594c3
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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