Malicious PDF — malware analysis report

Static analysis result for SHA-256 529fbdf1120efdeb…

MALICIOUS

PDF

88.0 KB Created: 2021-07-05 20:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3af7a319255a64ad65efd74403c38010 SHA-1: 49883ed9d927ae7b2947450abd16a7963e92e877 SHA-256: 529fbdf1120efdebc9c6628855a010ef2dfb356a92769c798f9018dd5dd35ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=how+many+water+bottles+does+it+take+to+make+a+gallon
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/78tss200letgflnf14ics901b3/wotabur.pdf
    • https://mimpiindahsatu.com/contents//files/tixukexofisaviliza.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/11298885553.pdf
    • https://urbanlivin.lu/userfiles/files/60987098553.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/63cf7ddaed0d23882d253b649082fa87/xapibomagijoponimixexug.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7cbe35256d3b7aa2150cf7d1256bd44f/zevanibu.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c709868bc412faf9513f87a2055cdbb8/84141759972.pdf
    • http://mamnonlittlesun.com/upload/files/zaxagepusidozexuziwanine.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0db55259---bixuxudozal.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tstioerdvodcp8s4d82nr68c7t/watopigizaselezo.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f8debed38fea9da75521b89d9c0554ef/79929875595.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87871a46f4660b2561ed7df0c22b24c8/78885493772.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce571fb5df0---656015623.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0bb634ab9f33a52eac055d6ce76fbe54/89779711137.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160add2ccb5017---18817510936.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73d05705df359ee3311d3cbfdee98e86/jujaxuvixugenukodewata.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92720480119.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40aa5893d---dajinadurosivusazuroka.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/nofagelimufewegawo.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6b423e3d98db5f6853f60310b2e1c67e/59033311131.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/35981507399.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/d823ccd0f09530cd6412455f7d5b68a1/54171283119.pdf
    • http://airelimpio.mx/img/editor/file/85630048109.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 16792 bytes
font_01_sfnt_off00010cfc.bin
f97aaee7511ee5aa409580175839b02ebe01180010b016d1607d88ade7e94e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 11012 bytes
font_02_sfnt_off0001265f.bin
39256ff6d06d75b3a688403cb57ade1a81fb6377fc2a9ade3cfc666a0da541e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 16996 bytes