Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b3d1eca2fcc811…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 23:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27a02c47d6f863c0c9f109e3be3ac039 SHA-1: b445a0dfe78abda2172d52aba1957fb6b28c5fc6 SHA-256: 30b3d1eca2fcc8118af96adee96aa7943770b3280910920c0b548c1043f71bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. It contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. These links likely serve as a link farm to redirect users to malicious content, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sweatrinserepeat.com/ckfinder/userfiles/files/18330652156.pdf In PDF document text
    • http://xahscw.com/userfiles/file/sutukoluzinanixotew.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/59309922916.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/57566146630.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/gasitewiz.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/putujibi.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/7107884606.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bobogowoxepidizi.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/segidofo.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/kerugafatizo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613423165a866---tatadiniz.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/juravexurojunetipurikas.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613537795bb5a---bifipotunafikabenoror.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210921011103.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/pumefesajuwu.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/suturajilewowowasizun.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/50673598248.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/143c72d10395abc5db994591fb1673fb/kivov.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/18172964723.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/zexusokimobakazor.pdfIn PDF document text
    • https://premium-house.uz/images/file/japirig.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/45c66ee74f159cc00640e3c47754c063/76668624584.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/19434530492.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/90044081860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=everything+i+wanted+roblox+idPDF 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_off0000aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 16024 bytes
SHA-256: 6d13a18d5184751255c79560e66bcd3324bf1857c831c3c24a4a76470e96f1fd
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 10848 bytes
SHA-256: 2fc8b1125af209a620f58c2ede3e4cbcfc3e9d545ab42d6709314c3efa9fbe99