Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0932d29cefaa90…

MALICIOUS

PDF

71.8 KB Created: 2021-09-15 23:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bfb066545d28eb15a0087fa0cfbfebc SHA-1: f75e0889ffb0faead9d8a2eb6065e63a14162b28 SHA-256: 6f0932d29cefaa907806367244076700cd40d164033a11dfd8cbd8fae6fd47e0
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 as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through social engineering or by leading them to further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=puzzle+quest+2+android+apk PDF link annotation
    • https://penzion-palice.cz/content/2095373414.pdfIn PDF document text
    • https://insp.biz/img/file/ketopifava.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0d1201b5486e5a3ec762c44f6f72dad9/38481337018.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/nononiwezaduveko.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd51fe45---zogodukasuxazimu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/61746017413.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/41408232881.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/81201618300.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/jonejonagufeduwolekezefi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c96b5135cbc41e62cbfc5ed3f9d4478/kepesola.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/31174292720.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tosurineluzimo.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/zadifefajomibazefibukiz.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/menenofupuvozaxapovasajif.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/poviteluw.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/26188010671.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kakuju.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/sinobosidovu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/turipizi.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/5921990701.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_163123.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/71169902155.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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 10904 bytes
SHA-256: e42d643c0b79719fd0179dedb1a8b999791758c795e74a7675b631d968e73664
font_02_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 18592 bytes
SHA-256: 04f4bdcc5bdd1980b1aa9dc0626bd607e70cfb812fde9bc2887893dd0bf0d8d4