Malicious PDF — malware analysis report

Static analysis result for SHA-256 f869b16d70a557fb…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 23:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61ae3b000569c67a29cced3cb36748a6 SHA-1: 7be41e3757dd202d393b58c8176fb1486946dcf9 SHA-256: f869b16d70a557fbe99fc36324a6d8a92c849e04d1c450e112fe17babe3c02a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various compromised websites and disposable hosting, likely intended to redirect users to phishing sites. The file's structure and the presence of numerous external links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=fermentation+process+of+wine+pdf PDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/653c22103aef0040d51cd4ddf026d45e/zurilifemate.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/tuwijiwokuvupebubevup.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d246fab1f0a---mitusu.pdfIn PDF document text
    • http://artospace.com/pics/file/jiwurovujipojevoso.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a5bb4d4aa62672be702a81209feaf6e7/suxuzobatojutiruta.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa34353c2---dodegubobe.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/67929851291.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/3364137036.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/71044046075.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/25398347389.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/41548147143.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/99706202594.pdfIn PDF document text
    • http://atiksigorta.com/files/61763733178.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fec1c859a2b643e31664e8916dca3965/44600120207.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d040eee1---xijekejaxal.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/57272844763.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kejagulajunosevijogopizoj.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3db0968d---zaxozubimitemeli.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/31191160583.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607908f98d06a---40042482139.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160728a8ae9714---34451613304.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_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 17008 bytes
SHA-256: 6e176688d046935d6b03d3b2582551265b6b73a70de65befeb660592b910c9d4
font_02_sfnt_off000140dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 10796 bytes
SHA-256: 047d0f2e0e053b9ca7885c5be4c8b0d0c2f72a2e8be84d5890b1097dbc991a83

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