Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c78df4bea2f26f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 04:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0e224f01eec86e0ccbd604b7a19f135 SHA-1: 9b2a05f11b51824c6f3d1bb10f84d561aabb8961 SHA-256: b8c78df4bea2f26f921b15caf7b62abcb310508ef1f8cd2a9ebcadb39bc348aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution related to betting scams. No scripts were extracted, but the structure and URLs point towards a phishing or downloader attack pattern.

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://catamma.ru/uplcv?utm_term=real+bet+fixed+matches+apk+download
    • https://mujeresenmovimientoplus.com/userfiles/file/33002525364.pdf
    • http://akinmedikal.com/uploads/file/41801978602.pdf
    • http://x04ydivan.ru/userfiles/file/18020959871.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a269053a2---lebesixetalaw.pdf
    • https://aiaciran.org/cache/fck_files/file/jibokenogaxopovijatiki.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/kebamuxifuv.pdf
    • https://euro-m.si/web/dokumenti/file/vofesalojarogok.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a4cebbf0---rufajevuriwive.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/matebomajuxefesabimuvepon.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/kjt4f7qn19s39qb634jerltg93/mugegi.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/541da54458a1f8fa654cab5f262d9001/bawodiwemolemi.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/risokaziloxanorubu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a825d5f1---jifolilesorela.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79672990149.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e84ac0eb7259e4ec1cc276755f357894/zadazaneneg.pdf
    • https://thediamangroup.com/_images/files/joluj.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4710dd9e8b---75372835637.pdf
    • http://verkaufs-akademie.com/userfiles/file/neguragulejexagixeda.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8f22f1df7---15998124261.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f5172903---vafupepofapuxokewotatubu.pdf
    • http://cgl.lu/userfiles/files/vetukedagesuzasa.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a4271fb4---82300538158.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a8523dc0---42345296339.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c162098d62---tizelok.pdf
    • https://laughteronlineuniversity.com/images/upload/files/77208093837.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b92f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB92F 16792 bytes
font_01_sfnt_off0000d141.bin
7a9a00794d9bdf8e84d644d21a3326fdcfab8077fabc248a52c8d21b1c1090a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 18808 bytes
font_02_sfnt_off000100a1.bin
5ddcc64cd37cb2bb0cec6ad33581041867b59005a7a79628fd2a5380f15d65ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 11248 bytes