Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aa1d372862ab49…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 01:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f643ce83a6ba2a55ed1b21cc2f46f767 SHA-1: f227b7ff06118e5c8f844d86b6a69b7cb712a2ad SHA-256: d3aa1d372862ab49cc10be6448d9312a1a883687b28d6ea8583c79db35af2c7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://garglob.ru/uplcv?utm_term=fl+studio+free+android+app PDF link annotation
    • http://citescolairedeledit.com/include/file/fofutirukewamulobetoparij.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/82999571429.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe1664b5d---zekewatejizufakulusaved.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8bcd31bee---89692518912.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe02b57d0d---81449609209.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/25527631319.pdfIn PDF document text
    • http://safarang.com/basefile/files/gapadadojawes.pdfIn PDF document text
    • https://bczenekar.hu/files/file/26384219393.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8694b254d17f1f7413b4f9e9e07c0331/60083153191.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0dc550236---bakamopipume.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tivuvodesebusifono.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/37967583335.pdfIn PDF document text
    • https://mytopics.it/uploads/file/49134664162.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/suvamadubolegawidiguja.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/48235282479.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xawikumepowutotezek.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vagedijolaludevisoguzodow.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/26039816020.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/239a7390aa41452f54365364c142b476/woserubuvaxegifab.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/livapujane.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/badewo.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/7813320420.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/gaxumesaletejos.pdfIn PDF document text
    • http://happy-land.hu/editor_up/90430002403.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sb5oaas1saol34kfms3b1ibpdj/jupojusilasozepafupurir.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/21580322105.pdfIn PDF document text
    • https://olterus.com/contents/files/dujubivavidimopikiboxoxik.pdfIn PDF document text
    • 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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 17532 bytes
SHA-256: dfeb3537a2b964150faa0e9a961dfe3504257f826c06c7c2fe98cc63bb58d1d6
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 10568 bytes
SHA-256: 7594592c301a4b25937947b311969a4b600ae4672d8bef4b1fe41fd8f06fa758

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