Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb83239e81c37b1e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 13:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07a7bd1caba73273cc5667b09f5438fd SHA-1: 3d7ea5932bf9d3987b8bd6f59b2b04567e3523eb SHA-256: eb83239e81c37b1e77d003eb49f5ccb99f6bde21d5f1d1cfb8a7768992832f91
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 potentially malicious files, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=floral+structure+of+sunflower
    • http://runo34.ru/attachments/file/45100005378.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b27a149f0a---batizebuxipuriko.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/45754954484.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150d267a8fdd---2926819841.pdf
    • http://vocal.bpv.su/content/files/files/bigemoxesiginaluxiti.pdf
    • http://pphjako.pl/userfiles/file/356342713.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/36306136608.pdf
    • https://suacuacuontoanphat.com/upload/files/podoliw.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03aabd91c---94835519723.pdf
    • https://radekslodkiewicz.pl/files/file/sedavabi.pdf
    • https://akonis.ch/userfiles/files/malasugekevovumeza.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/78671819358.pdf
    • http://devison-matras.com/upload/file/bazitugif.pdf
    • https://olgunbey.com/upload/ckfinder/files/42962928463.pdf
    • http://candemdientu.com/Images_upload/files/36810018059.pdf
    • https://12tiga.com/contents/files/mozosemotujofozowajanu.pdf
    • https://baglab.pl/galeria/file/66853959309.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/54920674153.pdf
    • http://badaranquehablar.com/userfiles/files/fumalupik.pdf
    • https://latrinquette.com/upload/editor/file/karur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7A 16792 bytes
font_01_sfnt_off0000c391.bin
0250da750c7f49749d0b4e93f9964fd8fdedd93d5f27669f9e360a0c91c3c6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 10400 bytes
font_02_sfnt_off0000db5a.bin
77063fbc8501144d747f8295c175e0ab8ed04ac998227b8fed5e160fb5fa4c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 14752 bytes

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