Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fe04c4ef14daf8…

MALICIOUS

PDF

89.3 KB Created: 2021-08-05 09:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6143d5b2178706dcc2bd10eee2aab85f SHA-1: ba1e561393baabc1276c8ea31e970a3bcfdbae98 SHA-256: c8fe04c4ef14daf82035226a76088171ff5b8849ca2139effed69c40fb085611
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier with high confidence. Heuristics indicate the PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=home+network+configuration+diagram', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=home+network+configuration+diagram PDF link annotation
    • http://falegnameriacastiglione.it/userfiles/files/99460130680.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/98111029176.pdfIn PDF document text
    • https://masihpt1.com/contents//files/varogunomorujesawami.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/8149968686.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/72036489517.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/zozisuma.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/55984764987.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/juwofemirawoguxol.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1u01sdk9sbinvgtbnnsbjqu1f2/vagedorobigedenowove.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/34580660204.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5db8ceb---5163184078.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cef001a04899cd38f6a79ec2584a4d3/99790244098.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/21i2hpd73om3hieio498k3g6aa/14164115844.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854952c3286---navonojuxufefexu.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tifibefevatawudebone.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3utgap5lm60me2jr637seddb3u/pufanedujigeki.pdfIn PDF document text
    • http://tfforming.ru/d/files/pejosudumoxuzefa.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/62556943029.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/pazeve.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/84812301966.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1c6415a8---49388724255.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/96348890560.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/81730214333.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/5669734059.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///47869121862.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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16912 bytes
SHA-256: eecff59a753cf4f65cdca5dec52dde728719a0f30250542f54f4f9954fb93ed7
font_01_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 10876 bytes
SHA-256: 8fc4712ac07bcc9255077d28451e0b5f1dd0cdc571074770b2cfd73fac9de99f
font_02_sfnt_off00013ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1