Malicious PDF — malware analysis report

Static analysis result for SHA-256 81420d5ccc7589cd…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 08:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80ec421c2f2f59b6e84d0893e85d319f SHA-1: f3ba943579bfb9babf684dc6c3556da872d42c80 SHA-256: 81420d5ccc7589cd0f893baa7172fcf23095d0caf997a7f468c1bb9886fdd281
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bud-med.eu/userfiles/file/37583671561.pdf In PDF document text
    • http://cuboni.com/uploadfile/hong202109070944438101.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/98304301171.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/siputivizi.pdfIn PDF document text
    • http://aprt1day.ru/file/55491259377.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/temomovuv.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/lujuside.pdfIn PDF document text
    • https://stvorki.ru/files/file/93288442428.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/totelojovuk.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec90761468---fidijonalez.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/dujokofafobimotunejar.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05a4ab3f6---mipofafixu.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/selubedukimujuvupaped.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/xituganopapadon.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910175000.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/48352658818.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/niruwexa.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/24000662268.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/minoxodekolulimoruf.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1402f823---womitunobajagepaturoben.pdfIn PDF document text
    • https://auto826.com/uploads/files/tomodurunokesed.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/20735691717.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rinojodowotuj.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/67730122234.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/29785354183.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/10464448763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+car+driving+games+apkPDF 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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 19008 bytes
SHA-256: eedfd67b8a28f730f107e77f08e386c840ccfc4d363a35c68ca1790c1c400659
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 11004 bytes
SHA-256: b227bfb1abe3f7919de426eb0ddee8ecc6a03ec3015d8d8698044b74a6c63908

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