Malicious PDF — malware analysis report

Static analysis result for SHA-256 920e3a388513bade…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 11:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a3b74455c28ae181b7ae41cc1c7fd558 SHA-1: 211a2406bf152a68a7ac6bab7ef80e3a813d7ad7 SHA-256: 920e3a388513bade0c27ad1fcda957d7cca95dc8cb271d163c85ce2ebe227c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

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://www.darvidproperty.com/news/file/59991731588.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/telurop.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/98786039610.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/zalafuf.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/91694272268.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/30287240821.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/zamenudupi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7cc013c14dcd3fe61f1e955c8f68c789/daxarot.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/51043143140.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8b9d93ca---83232557850.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/bamuvoda.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/96331169981.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/i1v0grb920brmj5uskdfjuptno/fogisofapaxerapuku.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/87350456459.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gamaninil.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/neribad.pdfIn PDF document text
    • http://ternovykh.ru/content/file/gipuvepotodezulomasefiwuf.pdfIn PDF document text
    • https://andhimazhai.com/images/files/rebibigilotatefo.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/77921861435.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/tikaje.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d24867c103b21da4e6b770fc8e6f29f/kikat.pdfIn PDF document text
    • http://imbirimbir.ru/files/suvemapibotiz.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/xaniwojarasiwelukagax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+find+my+phone+pin+numberPDF 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_off0000bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 16504 bytes
SHA-256: e2d987eacd2ba14d8046d2466969049afc71bce0a485931fc824f62a68c14e7c
font_01_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 10720 bytes
SHA-256: 714f5cad110193eaeed30c149b54276af9e16d28c5928e58788c80c24b053c96
font_02_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1