Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca45380fd2f15dca…

MALICIOUS

PDF

90.1 KB Created: 2021-07-30 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb2f560d266a42ff85cdb5cac0ee01d6 SHA-1: 59f981aae3d626dd92682673fea09632f0755e40 SHA-256: ca45380fd2f15dca9bf12526e0c0aaf7c69a4ce100ebebeffa32093a620d2acb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://china-baby-clothes.com/d/files/58204423836.pdf In PDF document text
    • http://grandinspirations.com/clients/75274/File/34050415011.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wenumepoka.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a345e8cca63---2273498535.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/bb32c938927b7192461d6256628c5821/koderegesumesego.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/29177478108.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fff638e1c8ae1dede38dc6f7dad8b527/19414745303.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/zagukudokitusofudem.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e10470a90ca85c944f78fb6085a40a6a/ruxemiwibatabekixedakabe.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • http://hak-al.com/resimler/files/35199147573.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kedakodexor.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/batorisabukuxalezelaliku.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/wuzenorimulubowomulu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160790105e89ce---16377264904.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/pezoru.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0eptnphk9nuotabcpivuder732/55260365241.pdfIn PDF document text
    • http://runo34.ru/attachments/file/totezinupubefizofav.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lafozodiw.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2745e7ac00bb9c440be041b14e9536f7/zuvufugupinefububisupu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/45468114080.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/funododamanof.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/63562607658.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/78246071395.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/86300412611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+do+the+symbols+on+my+hotpoint+oven+meanPDF link annotation
    • 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_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 10872 bytes
SHA-256: e9ab74358e86717a859c9eb9a5a93207c1f487467ba58078be8465415d00a227
font_01_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 17372 bytes
SHA-256: ccf8f93c44d7b40c142471300a6b6a277ca43852a0df757cf40e8edaefb91722
font_02_sfnt_off0001423e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1