Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac0914d8bbf5542…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c8b69445a6238fd438bfeea2f8171a1 SHA-1: f685c85c819efa08b1fc3395aea671f56b8387f3 SHA-256: cac0914d8bbf55421d2535af2b881fad5a46556d572192c9843a4ba409d78212
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript further supports its malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=shadow+fight+2+mod+apk+new+version PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/48416914901.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/dezasilopimarisuzodopiw.pdfIn PDF document text
    • http://kasand.com/userfiles/relebaworuworusis.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/kirezifi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ed48oae7iq3ruo477ieh243bub/66546505862.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/28902987047.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/geximezibixiwotedanoj.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/34754168843.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/6615017679.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/mujozuwetibovufekexowit.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161372c62e7efe---32187935504.pdfIn PDF document text
    • http://clingac.es/d/files/1976381191.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/jawilatewekexugakavew.pdfIn PDF document text
    • http://a-pluset.com/userfiles/dixitebemi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead94edfd9---penikifedan.pdfIn PDF document text
    • http://lachina.cn/upload/file/4971350689.pdfIn PDF document text
    • http://temple.mo/userfiles/file/46148705435.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/devama.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/22553598315.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/xasevif.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/93024043466.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3f3cd1677a7644e023a7ae5cd61e5e7a/82596702110.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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 21208 bytes
SHA-256: 316a0ac4dae590397ee01a70a6155cc895db4abd6cbbc2de50bcbc3dd6bb53a3
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 11336 bytes
SHA-256: 6a497c5a444c0a0908dbe40fb6744abb63c6a2e0c128e51dcbda3ace8733f691