Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39e18f25bd975cb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-15 12:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f155ce370cca6785c5c1a1669a2516b SHA-1: 0fba5a913ac73ae01435e4c5a17933c2bb312988 SHA-256: c39e18f25bd975cbe1d265858e41e931f18fbf3c205d23fd45119a22b74e7589
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=granny+1.0+download PDF link annotation
    • https://chachachat.info/js/ckfinder/userfiles/files/zelukibumomufaweme.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/90914685219.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/93748350330.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/52379577515.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ed30398---64136048855.pdfIn PDF document text
    • http://recviem.ru/img/upload/86385092636.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/52248061069.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/ramupunobalewimuxo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa2016835---74132244414.pdfIn PDF document text
    • http://askort.pl/Upload/file/184666226.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/57937125801.pdfIn PDF document text
    • http://schokozentrale.de/idata/gekorizu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t1rvas79sd8l8rrkn6ova4a63/ninisix.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/4674498768.pdfIn PDF document text
    • http://tdbm.vn/upload/files/64682519017.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/gupuwovetibaw.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/2274759319.pdfIn PDF document text
    • https://baglab.pl/galeria/file/97358635528.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/42045555737.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1593d3a9fb860890b5aa199fa4d3091a/27924614414.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/79143125247.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/29554978707.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35c526e5e---niketuvokagiwonefolezu.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/74423458291.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/63465375910.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_off0000b4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A5 10232 bytes
SHA-256: f1c2bba1f60efb3c1f473d1d5b12b3a5fb1730d02262ae6562402f5ce00058a7
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 14740 bytes
SHA-256: d534c0a7057d3449714ca6751eeb28465c8b1c7a510fef567ce9c3ad46a870d0
font_02_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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