Malicious PDF — malware analysis report

Static analysis result for SHA-256 078dbfa7bce6dedf…

MALICIOUS

PDF

85.0 KB Created: 2021-07-21 22:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9304e6e3945fc936ddf71b2fab4c02f SHA-1: 397d67580ae46e8939389129465fe259bcc479f6 SHA-256: 078dbfa7bce6dedfe623b4c7bd8c050f23526da4c44a62b41a5f0c6389dfa6a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://uniradioweb.info/userfiles/files/76559919609.pdf In PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7cffcc4c9dc141553bc8dcdaee0b8589/36590216674.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437682ace2---98003086342.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0af6e4e38---96324540824.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pelividipijibader.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b37823e8---nuxixepidojovixegexemif.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160da37ba91447---14331519994.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/lotifoveto.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a257da7fb59---monaketaposadofulivejeg.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/fuvex.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/mevada.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/86815067648.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a8474e610---77178155912.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/43820868246.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/si8tu65at825obl0us16npgtl3/xanod.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/xitetajej.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/320331a1c47633b569642e33d236fd66/86575455923.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/negevales.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/84278355683.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c637a03fe6a---numagefuwafedelimeb.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/penakedepunomobegozawifut.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608473b51004c---likebovanetulododinuwuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=open+and+closed+syllables+worksheets+5th+gradePDF link annotation
    • 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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 11292 bytes
SHA-256: 646ca18dabb69aca7c7a66f7499057db912dc985026dd7f925ad0af49f782e94
font_02_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16880 bytes
SHA-256: b80e53f36a5c5704cb50a8605a9a03a49faa1a864f6f0201f6748f4f18a245aa

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