Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c258d78b6086306…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 23:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0afcec36150b3009d5c58aeb9d631e1 SHA-1: 5c14b27462dec71db2f68e1c1ec25a0f9ff2bfce SHA-256: 1c258d78b6086306051ef323a0125ad7268bab0bbcd025a4a4eace174df05bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=call+center+job+cv+pdf PDF link annotation
    • https://youkuvpn.com/upload/files/bijoxetuxuxoselodupa.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/54681571576.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/76852774919.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/wivajexe.pdfIn PDF document text
    • https://kildevangen.dk/files/98076047863.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/9c98e60823d5021abd6a2908ad0ac955/pesuri.pdfIn PDF document text
    • http://jawarakreasi.com/file/45610244651.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/vabuzukoxotimugu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/xakopibugutekabowu.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/42197484585.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/nolixudosivigonol.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75126da354---mujuwamav.pdfIn PDF document text
    • http://biosite.ru/images/news/file/kejir.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8789be0fd---9624869200.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeb299407---kelebulonowazudosaro.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vebematudexus.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc51b211a9---3464690597.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/bojokexosupofigiwibati.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/wubawiwisar.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943185a80b---20728532626.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16100e7d086e2a---75811188853.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/oslb38dcf6dga8dkp8apmhcqol/vadesumukis.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6c258b9836e8099bcbee82c782122262/28754873064.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6f059fh23rkhj38v1mgn7ajqr7/wogatozetoxapexipisaxus.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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 10720 bytes
SHA-256: ec397513ff77156f295d1b2b52bdf27a05e77f98a5fd0a2ec8db84efa862dfe3
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17412 bytes
SHA-256: 49eeb5e14844099dd324c1137943a5244959aa2f89c3c8fc16367fc83233545c
font_02_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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