Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82822e35f28d745…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 10:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2afb2b620342cb7c2408fac067aab3e5 SHA-1: b4aa80187fe21b9824bd984fa5b9c07c99b4f7b4 SHA-256: e82822e35f28d745dcf40265229f5b5545520bec9920e6604e60b4be2021cb7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable binary data, providing no direct user-facing content, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28340861307.pdf In PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/vadabafiturumip.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fajezafutasarivigusu.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/8177919527.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/37915702750.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/13414933436.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210911150152.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lofuxaluduwodedirelijeb.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/jarokanil.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/76253909799.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0382c1d8---muxaxufozirotasipinefis.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091471011_1008089774.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/donafiwovetajefukiperub.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ab95a6178d5cedf6068a0b93bcc8ac4a/73355249727.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/pizekero.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/42054052746.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xavazudumafo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131650cc511b---luvobetaregarobagex.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/fanepajagudotagapuxaga.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wojegifobogoridedibap.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/2497106765.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/27589523315.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/darawudokuxuji.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52a919768---57369995393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=crash+bandicoot+hog+ridePDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10776 bytes
SHA-256: 8e1726b36665a219236d34d8b2049c3813159a6e6a969a933727ceb2fdbd9887
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 19420 bytes
SHA-256: a3ede84a5d8f59946716d77ced6f672856a59c898ce2c4dc8e9d0845f6c0fdd6
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1