Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84c20066e75ec48…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 06:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06df8f3b811a118a9780f1c6efb66c73 SHA-1: 9094943e53d5890e2553c303bed2c9661c1b0e00 SHA-256: b84c20066e75ec4816b3c9cb8e094df9a1b9c55cca7f1b281b1c0b0582e0f8fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://laborke.ru/uplcv?utm_term=length+word+problems+worksheets+grade+2 PDF link annotation
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/058d7fa21c53ffef16ef92553b193863/63596565837.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/kaxikitotovon.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a791308e108---burigexajokosevapideza.pdfIn PDF document text
    • http://soupworld.de/upload/file/gobexipato.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xemabupavisiros.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161312c4b31345---14123263734.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/3775962381.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/scmel2rl8jiu6qqr6vgsfatd36/55694021395.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/40518485087.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/60605915055.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/73832697805.pdfIn PDF document text
    • https://agermag.ro/mm/file/35802800598.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736da9062f4---67343166727.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881ec621d29---20270698188.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/xodujupufefiji.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dca572bfdb297b65850f05c50a504510/duwejidudidawe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vscb8l7o8iaufdllvnsfs61tl8/90369077676.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbcc69dacf---lisibegasejitixi.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dapurulematetenasubatug.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/nuraxidusaxetepu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/80277965094.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/fusukofosanapetuvudamowut.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7e0d321cda9e6c57c5c67198e6dc0056/55302754920.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ktugv76vem7rivm5hqm0fr4960/98891413448.pdfIn PDF document text
    • http://skisun.it/userfiles/files/jezud.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/vidij.pdfIn PDF document text
    • https://endobible.com/userfiles/file/koxegitinixovefog.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_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 18396 bytes
SHA-256: 1d304bf0b39223fc3e649e07720d2a9979158e2584b6ba0a14ef81208c2ad8bd
font_02_sfnt_off000142dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DC 11144 bytes
SHA-256: e676b992ae0610d3a3cf0d411a71c00edc3891f755994764593178d78742669a

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