Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a75d029aeddae0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 01:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5794693607a3d341c2377b572d04662e SHA-1: 66d400cf8860272cef54de0a82e75f8bf7cf9877 SHA-256: a2a75d029aeddae07aa6583987e752b172e3db2aeab5b3a373a6ecb9bb9dfea4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/63762006508.pdf
    • http://ytlcases.com/userfiles/file/29814722869.pdf
    • https://anukulagrotech.com/userfiles/file/fabisuwozeparasete.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98ba0463c---85618710898.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7099518640.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/2849716688.pdf
    • http://intersonik.eu/upload/files/lunudoweso.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6de581ac0---3080338542.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/18339686448.pdf
    • http://awarelaxcentrum.cz/user_files/file/wuredakedodivefemiv.pdf
    • http://sportingfoundation.com/uploads/file/zawezetabowupigapukejami.pdf
    • https://tectrongim.com/uploads/file/68571301705.pdf
    • https://textosl.com/upload/editor/file/48830543657.pdf
    • http://jcnjl.com/userfiles/files/97710817634.pdf
    • http://tandartsindex.nl/images/uploads/83138659184.pdf
    • http://texinpack.com/uploadfile/file///2021092814571186.pdf
    • http://www.somdattabasu.com/fckimages/file/16845226205.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ssdqili9hm3t50uoqq2h9k1hi0/buvaxiloraborozas.pdf
    • https://actaviaserica.org/board/file/files/zenavag.pdf
    • http://kasaitogo.com/uploads/files/vujogamukapoxebisezomebi.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5dacaf355c5264afe63b6f2aa487060e/nodojubigoxewuwex.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/woparijekapusojotipulaz.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa0a03b25---42658348044.pdf
    • http://salkim.com/userfiles/file/liruvazujebogarejaxojoper.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=korean+drama+apk+2020
    • 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_off0000b0d3.bin
23440504c1e1ebc86fdcb5dbad56b4346b6b4ebd222a8cf6d3d84f6a44b27b72
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D3 10476 bytes
font_01_sfnt_off0000c890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16792 bytes
font_02_sfnt_off0000e0a2.bin
33c22be7278ac85b88700f6c2891da504d2b4210cac7f521cd13444e0edcb2b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16280 bytes