Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72f9bc51e835b2f…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 08:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70c106bdc6ef7fd5cb1856cb202383d6 SHA-1: 9e6945406f37f3086969863e72669e699f07c34d SHA-256: f72f9bc51e835b2fef6c107ee09fb1435a330fe679c5cea934ff8eedf35c1ee6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://klasykarozrywki.pl/public/images/fck/file/27774389429.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3b06762e---19166726099.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab51c1752d5---87703363266.pdf
    • http://trustarshida.co/cache/fck_files/file/vadazagubuvadinakeme.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/d73rge1gj62pn6vn67ovv19gab/jejamiludabanufij.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210603_110108_1182.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15798194f5---12373808576.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/runuzekamojovefos.pdf
    • http://www.zywawiara.pl/pliki/11350890601.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53c80805d---2139874213.pdf
    • http://asustainable.com/global/file/vorifitutalekapedowa.pdf
    • https://betentour.com/sites/default/files/file/xukubefedasalosegimosid.pdf
    • http://10glazsikeyrosa.ru/file/94985342529.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b55c4691---72427537397.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b72847edd02---53619791400.pdf
    • http://jfhcoaching.nl/userfiles/files/xebivodegave.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087924159117---pizajojufujidefefi.pdf
    • https://bataretak.com/img/files/file/48767546457.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a217dfdf8bb---46312124547.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18a00a275---46402148934.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcbc9455ca---nobubipivafukememuw.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/23e2ddcbd849e9b276aff0fad7b241db/91616541651.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=12th+court+of+appeals
    • 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_off0000e628.bin
f1b1f04bd1077ee6fa569306e98cf8971ad5610fd7bf93ca8c0c97299eb0c6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 10556 bytes
font_01_sfnt_off0000fe80.bin
1831018e9f96a632f0206ce5f4d6e68e81b97e45134b0bb221d376875f2ed0fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 17536 bytes
font_02_sfnt_off00012c7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 16792 bytes