Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a2876bd11f3576…

MALICIOUS

PDF

90.7 KB Created: 2021-08-14 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17f69308d5567c4ea0b7ce74a1a3ebb6 SHA-1: c314786184b516c13e6f3c7fa9ce8b15845b808d SHA-256: f6a2876bd11f3576799e5b53ff5868542e46839a5903c5b2ea086c70199aadd1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress upload directories. This suggests a phishing or scamming operation, likely intended to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://donateagift.eu/userfiles/file/fevakufirimadatumigoli.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608187102af93---81416781517.pdf
    • http://apexibd.com/uploads/fck_uploads/file/52051568191.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i7m96rfdvugugt33l44o187ma6/77622107396.pdf
    • http://mamam.by/upload/File/file/sobuwuvimufajotodapovol.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/efdb3f4febd53ad4b7d86768ac4cfbb2/26857456114.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p1rsngnbptv86rr9u71haq5884/60508705770.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/440286d0af8ae814e13b70bdbd09a55b/tolotuwetujazonejujep.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/gitajinabevinufutifal.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/51016844941.pdf
    • http://zovsh.com/Uploadfiles/files/bijoz.pdf
    • http://abwhopewell.com/uploads/files/gegolerosuvi.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/88585687323.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/kotirejugidubojoxu.pdf
    • https://coastalstudio.com/images/main/file/3665143313.pdf
    • http://paillasse.hu/userfiles/file/99733705891.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/018dbe0cbfe702db2829d87aa6f48864/bijewetasovujuganubub.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bce49097958---guzesolalubovafoxemovedip.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f4a6dcc488bad0596712d5f51e64a4e0/fonumiroxobafiteralewov.pdf
    • https://papiratisk.cz/soubory/dizafuk.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c6b75e8e6d4f543bc578cba5ac9b1a2/52836629122.pdf
    • http://finemetal-cn.com/upload/files/80174256703.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f172837d4b098a5d25fe2f8b73f52bd4/7408809241.pdf
    • http://eperon-kochersberg.com/img_db/64884478249.pdf
    • https://energooptima.hu/upload/File/fawikuledesegutobowugezav.pdf
    • http://nesemlak.com/test/images/uploads/files/73611190375.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=valores+normales+de+los+signos+vitales+en+recien+nacidos
    • 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_off0000fe0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16792 bytes
font_01_sfnt_off00011624.bin
bd668fc4547d4b97d5a450f7cf359dd87e79dcebfb75429a9f9de789d5c16a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 10748 bytes
font_02_sfnt_off00012ea3.bin
7a9a16889e585ab460a16f9f2caee4ca53f20c86ce8bb0924212f8e800da348e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA3 17284 bytes