Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b7e225db64eb0…

MALICIOUS

PDF

99.5 KB Created: 2021-10-09 09:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 047c8fabf91e90023446896eec59d374 SHA-1: 35012b9631d2f34d6502e3110e29030840a458e5 SHA-256: 019b7e225db64eb0f9c352832a28de198f953bf9f91316d5b81103c1ad33ba58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=c%23+new+object+array+with+values PDF link annotation
    • http://technology-mp.it/userfiles/files/zavolivovasiwu.pdfIn PDF document text
    • http://schokozentrale.de/idata/44713642266.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garugobatomuvaduzi.pdfIn PDF document text
    • http://webbuilders.com/files/file/82891477793.pdfIn PDF document text
    • https://luminex.pl/upload/file/86841648215.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615fdec3053ff---logedobuposewopuganirox.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8g6b4v7q79a878cjoteakk7qrm/papuxujajirugedetime.pdfIn PDF document text
    • https://mkontroll.hu/File/miwidutu.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/55403845540.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210923_33390D567EA8B34C.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/91936191360.pdfIn PDF document text
    • https://bagstyle.uz/images/file/rivibalosod.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/vuxogudunivobun.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1de14beb---kufuluf.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/10069483498.pdfIn PDF document text
    • https://pkbae.rs/files/96596690671.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613879f6182c4---nuwukosigi.pdfIn PDF document text
    • http://antracit.topmebli.com/content/xuploadimages/file/merimiwizagebaguz.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/runaxarobosajime.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5a0c549cc---pobunigojonenoxev.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/13487809665.pdfIn PDF document text
    • http://inistor.com/ufiles/files/27190855811.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_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 26972 bytes
SHA-256: 6aa00fd0a8f01d3d08b4fadb66467184204d6ec2e7a28633112d70f2c6a4f7dd
font_01_sfnt_off0001564e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E64 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804