Malicious PDF — malware analysis report

Static analysis result for SHA-256 2716763e317cb4e6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 16:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5e5f319c53e7eff31121cee74419e42 SHA-1: 6caf98ede955e6abc5130895c01ed9303ac4abf4 SHA-256: 2716763e317cb4e66efd7bf21288df8b4e81e5b0280dd98f2f082c06266736ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://nomylo.ru/uplcv?utm_term=download+chaos+ring+3 PDF link annotation
    • http://seamcc.com/UserFiles/files/19531260867.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6eea0039d64bd19a686c2adcebb6e241/40610960085.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d341aab75a---66390322172.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916061421165897.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/rubotuvizuwobi.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/73203330974.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/zanasetefi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/38r3anjd13n6js3ur08vb1u4ge/35833527437.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/juwagit.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/35369973060.pdfIn PDF document text
    • http://jsdarvin.com/files/57541745217.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/dojaxig.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/firigedaduzaz.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/87903999949.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/vimawevikiliwoluzivupovit.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907092404876875.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/fadezufowukolokerefeju.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/kosiwagetulen.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/78603360860.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/mavewewozep.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/bakorumivapa.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/nasuwaninomijamixubale.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/mipiwomipiki.pdfIn PDF document text
    • https://businesslife.com/content/files/4905250020.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10680 bytes
SHA-256: 14d3b5a46b274e1200699e54e8bb10cc7c0f338901bc70768f2c93b3d421cfb5
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16400 bytes
SHA-256: 793796bc6f3792fd46804e316ad919dde0c6e596be71d7a0216cb757f4ce788b

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