Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2d09ff5c9a118…

MALICIOUS

PDF

92.6 KB Created: 2021-09-02 16:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc4e81cd8a5e77815c6547984dc10737 SHA-1: 768fb67f6cb3ff445d30230cf46bc29a1a4ea479 SHA-256: abf2d09ff5c9a118392b2c96b6cd59b9ceff84f7719545326b00abd175783add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's part of a phishing campaign, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=calculating+impedance+pdf PDF link annotation
    • http://atut-biuro.com/uploaded/file/wewibabalebuxisotojefumot.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/354c6c951e2c3cd220ea4c0b7abe5948/28379779528.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae20b341f---tuvejerezolarujebapuk.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44125d2504---kegij.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29111d69d7---64306810189.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/73982202674.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/54695202201.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c553c9991a---dasinedagupewutawi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4693881c---39752201144.pdfIn PDF document text
    • http://allycatering.com/userfiles/93965599478.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jojonaliwalidisuxowobis.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/04ae5b2d954c5028b467ad2e6d2af8a7/xunudiladifonadudepazawav.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0b9dd410---zewubarav.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210707083515.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210625095352.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/19788941677.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/korugomutewigabitogu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/57dfeeff017a356f67c4b03ec37b0cd3/93478854257.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/77518413590.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/46334315973.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a983be68317db510c3f1ab1eb4a11570/93431053503.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5pb5asu6kh4q0hj1a2ecauak6f/45764159896.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_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 10708 bytes
SHA-256: a1b2751d174132fa18c1a3419b4135f92fe583ca81f218e40d756047a733a389
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 17868 bytes
SHA-256: 13af6105a247ffc5a29e56974a2d277f6fb6df497d3d61f08087e166a797ff8a

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