Malicious PDF — malware analysis report

Static analysis result for SHA-256 7035d11bc5ee0842…

MALICIOUS

PDF

127.0 KB Created: 2021-08-10 03:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02214e9cb0d8bca824f1f73de9868600 SHA-1: b98da817f387ac7249f6d901bad2d2c7d32fe9f4 SHA-256: 7035d11bc5ee0842baaeecc68bb86c1f1577e48c34a673cef75bded0795f9b34
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains. These links likely serve to redirect users to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=subordinacion+del+interes+particular+al+interes+general+ejemplos
    • http://mutamobilya.com/images_upload/files/rajemekemujise.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/6qnel1bdt0rg8f0glbpdekljr9/giwasitugiboboxemofuko.pdf
    • http://hzjksj.com/images/upload/File/nojezorevuwufanolav.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/997jpq4l4tvamdroe1ksatlnhi/murokixodebitejovag.pdf
    • http://eotp.info/sites/default/files/fck/file/51119754135.pdf
    • http://matraholding.hu/images/userfiles/files/14573216731.pdf
    • http://chromatographvials.com/d/files/79692822928.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/rupesovitutemerorixeban.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca38cab3c---68575252521.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fd98693f831f53e4c5aff285fd864714/73408563899.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72517434624.pdf
    • http://leaguengn.com/userfiles/file///buvedovav.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161009e77e5a5c---36136034747.pdf
    • http://www.puhito.hu/uploads/bugakamawobefixame.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/6087383075.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c761c2d6f223c2102b1092a28fd4bfb0/sizazozezo.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a4d21f3b---97443284858.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa474134aa---59064377913.pdf
    • https://mvpartners.be/images/uploadedimages/file/46230564422.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16082abb3875cc---vukukujaletukiludarix.pdf
    • http://denis-lefebvre-services.com/fichiers/file/88836019549.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/hm8qjh2n4ija0p01stckvqnu3e/11636977138.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cfe152690ff360b66b32216f18e989a1/melodap.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecf540b44---sefur.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db360eb18b0---vukobo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018832.bin
5348f4444c97009d78e947efc661adee7e8c9a4fef200a7b41d4a55ffec9d8e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x18832 19072 bytes
font_01_sfnt_off0001b819.bin
ba3294762a7deea6ccf99798a739f3104e7ea00a20b083a77e49d6560f4d3560
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B819 11304 bytes
font_02_sfnt_off0001d225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D225 16792 bytes