Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d425305e7d31c1…

MALICIOUS

PDF

91.6 KB Created: 2021-06-11 19:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c82b971094a03c62d6cca30db2e3ba61 SHA-1: f06c4aa0ea095fd7848bcfc698e7606be508151c SHA-256: 89d425305e7d31c1220123f077ab8159c45bf97aa05ee84637704f51e6137305
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised or disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=half+blood+prince+novel
    • https://eatorhours.org/e-bussiness/fckimages/file/40668531165.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dd54f7acfddcc491e6ed990088ba596f/38959055163.pdf
    • http://axwelindia.com/uploads/fudixagazesajolukoxupop.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609230bfe3039---42451311544.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094aedd0c5a7---jolipogafar.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4ac3b8cec0cdd0d6df9959c7bf1d5f2e/ratuxerasurovitikuzawus.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/mumaxezasebar.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9ng6isfp6n6v82082jmj0ghjqq/nofufelexumewoxosamapuxu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q93128fk55s4tjiqjbja6hsrbg/88478868410.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c11e145e---kivamiletenumutidifeguvoz.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2d98b199825016d3240be615e750180f/jigaxogiwifikaj.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/743aaa38e7ad22926e1eca85d290bb0d/vorumovudegado.pdf
    • http://www.euro-fly.eu/userfiles/files/46668585890.pdf
    • http://anhopphat.com/uploads/files/92285862889.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609456a586c2c---38928485306.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0236bea62---75933975312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a34.bin
29132e6054d55cfbb0a29098e4238d411407526f27eae3abf82d288d0a5dc872
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 5132 bytes
font_01_sfnt_off00013bbc.bin
c4d96781134533eb5560c72b43c1a1d4f83b5929bbca65eefa03073cba465de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 11660 bytes