Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d356973166256de…

MALICIOUS

PDF

73.8 KB Created: 2021-08-30 16:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01091c63ec0bb4ceec89194ffd001cf9 SHA-1: 085137d3e2e3008c0a94f037a5ffa7305981d9f7 SHA-256: 9d356973166256de3f4fa888ab9d270486ba16894155e3b08e7be64938e7b3b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xn--o79av69abka850ab6c.com/upload/file/202107131635087517.pdf In PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/tawomasizitirevavibolu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/komezajizibivudamesiw.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/88007419011.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/67d36b07a2cfc83c2aac96d2a3468f2a/33607182498.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/74344453715.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/56023895318.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kuzozibuxesojazaxikutenak.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/18929585703.pdfIn PDF document text
    • http://htygroup.com/upload/files/38102273944.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bb2d40d4ada5759acc720106e40d4571/623721304.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/nakagonegarimozuniro.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/13935626758.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/52156910539.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fc73850fbfad9735624286105a95915/82668473868.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/boben.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608147be3b8a9---soxatisaravubodanogekeka.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161139f2aec72c---859899244.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/69072931935.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/86159182147.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080a93880c22---44936826144.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/86361968451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spider+man+edge+of+time+pcPDF 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_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 16908 bytes
SHA-256: 888dbb9c6aab526b62aca5e7b789be3b1c8c6b2c5080c9719efc5883a4f83c24
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 10824 bytes
SHA-256: 95b4725f122ae719b13f63d6c29b2d72362034463cce82c7bcbadb4a124f533c

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