Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaabbfed97dab49e…

MALICIOUS

PDF

55.8 KB Created: 2021-05-16 05:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258dfcc88b2eb48d28541377120a3388 SHA-1: 47340ae0072277de5c15cf1df89567e3946b2caa SHA-256: aaabbfed97dab49ea3bfb7dfc0f3c76a8f1e4b5c8de14adc01d1a3259e2220d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a strategy guide, likely to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 5

  • 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
  • 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=axis+and+allies+1940+strategy+guide
    • http://precedent.by/_newsite/images_from_html_editor/file/runesomadiwulani.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/ribavoratidusagekivude.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccde9d36c---85297545852.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/59ba461999ffcd73b5fa2796912808fc/zexososufuzadod.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0097b703---daxevigiwonurudupirik.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/osek37m6ncrjeav42ih241ildr/pegawevuwuz.pdf
    • http://automsystem.com/UploadFile/file/20210502212453626.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/1111714395.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a599cb9d55514ac1febd0fbb8d6bf64a/netufikasetiwefe.pdf
    • http://beiwendq.com/userfiles/file/32656852630.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/rrjs0viomls991t1jm8pr2cpvu/sunosubatulutesex.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503164419856775.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/jepekumoxukimuton.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s1jlpfactopdhvhbqt1ud6ejfg/ronenuvukajasevodowabuv.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ed2648a1---jonazojaparu.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507050609409820.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c0677df7---diralojud.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/196b721bb6fabb17dcbb4092ee46ee6d/15421497012.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13a.bin
db2caa314b8032eae4f185fdb515de824264f3d63472b7ce932d8eb287865bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 5592 bytes

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