Malicious PDF — malware analysis report

Static analysis result for SHA-256 f514c591b47a04f4…

MALICIOUS

PDF

91.9 KB Created: 2021-09-12 04:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5798a3f1163e1be42ed771655d65b367 SHA-1: 632ae9b7cd3be1884bc8b650b68b68f9b24ce169 SHA-256: f514c591b47a04f4c48f0d7437089d7df08c95ef6d6e82686128bc284d1a26ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gagiongvitgiong.com/ckfinder/userfiles/files/nifasasuk.pdf
    • http://joyandwowbook.com/upload/file/sojodilewopekakafo.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/45313882136.pdf
    • http://ivelinabozilova.com/userfiles/file/43862067341.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/tafopokuvufovedumisab.pdf
    • http://meta-min.com/files/xiranesuwilezoze.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2ef6097f---24258543090.pdf
    • https://bbpartner.cz/userfiles/file/zazenewagebasibutugoz.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe389e3c1e---rikomenaletumifiwesiz.pdf
    • https://nurea.se/currency/userfiles/file/41879271982.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/vusineberivasebipegi.pdf
    • https://xnkvinatimex.com/uploads/files/xelomesuxo.pdf
    • https://italvaping.com/file/tajodijumixetonobu.pdf
    • http://jpsacademy.com/slbdavbatala/userfiles/file/82999253222.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4406e045---11342148597.pdf
    • http://www.mediagrand.hu/data/editorfile/guwure.pdf
    • http://jujucuisine.com/userfiles/file/luxovizokagorir.pdf
    • https://suma.ca/upload/editor/file/mogulovewozuwewalumu.pdf
    • https://musikkursus.dk/userfiles/file/45160903236.pdf
    • http://bctlorraine.org/userfiles/file/juwakev.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/5802621371.pdf
    • http://s4l.vn/storage/ckfinder/files/gegop.pdf
    • http://achwvs.love-mrt.com/upload/files/84373283286.pdf
    • https://peoplehelppeople.net/uploads/File/97290654032.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=soul+2020+movie+review
    • 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_off000105a3.bin
68f6c4f9fc3a2420a4c2398711df79df26301571a4fe9b4c612d185a16d2c5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 17228 bytes
font_01_sfnt_off00013263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 16792 bytes
font_02_sfnt_off00014a7a.bin
d44966f435d401b8d0c1a35580952454597dfec65b3e07eebf1397c19d342748
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 10308 bytes