Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f356b216dbe51c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 428617aff0c2581aff10a28818fe0011 SHA-1: 3504b69b9bb6c90e8ec4bcbf4afd0e1b117901c0 SHA-256: d6f356b216dbe51c5d8d42f2976dc350551379b7886d7c4fa5199ae78c859b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure suggests it's intended to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc58bc7ae---24355936410.pdf In PDF document text
    • http://hycxchina.com/filespath/files/20210902111655.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/xitobamilapojefumovowesa.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/palewulejoxena.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/91c91433742917d7bc93add1283f544b/dupipoxufibuwad.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/zipidozef.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/jonek.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/58492069762.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/tilojuxaxotofegisog.pdfIn PDF document text
    • http://rurisnet.org/images/file/wagadufitarogizebom.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/np14gcc2sm89u759ubfpgbi9ah/sixuzikikoka.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/gukotezi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c72f2b8d9---33172289117.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/faralixilima.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f7a5b1da4402259ac381f51dfdb1c5e/todefetinapowudixukitape.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/zifokunabu.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wobepapadadi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74d6ca7c19f8a61df5707bd6cd26863f/58719872185.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/43624367213.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/jisikikebi.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/zonit.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/10725975487.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c1b9199a---22016139898.pdfIn PDF document text
    • https://eventaipei.com/upload/files/67660684528.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gawepuwowoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=biology+class+11+chapter+1+pdfPDF 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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16964 bytes
SHA-256: 8f8c2af950d0bfa438e773a3feeda56959a545aeaaac832bc25ffae0d1814dcd
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 11012 bytes
SHA-256: 6b3c44480788ef3c26209f4d7c4d1f6a756ae13782050667adfa0994443908ef
font_02_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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