Malicious PDF — malware analysis report

Static analysis result for SHA-256 9969fc7d9f0d75bd…

MALICIOUS

PDF

73.9 KB Created: 2021-06-22 14:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71f3f49d0c4405f720e7e09c1282e054 SHA-1: 3f577110f9aa9c9d09e3327a31cfc17c88c9d5e9 SHA-256: 9969fc7d9f0d75bdc5f3d96da2e33016d7019eb24b6be5377794587829adc5e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to potentially compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe34ddcb44---mazim.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/iud9id9h72gu7pdkjp0f7icd82/80977921594.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d19f92610---jasuk.pdf
    • http://kuzfarm.ru/images/file/60302628859.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b6h4t2ij4c6qq5gj5e76gsf92l/natitoloti.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e621bd949f---21609770760.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/543e4aa986f1e68220f863628f5d7880/38159786859.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2ad713c---48308276116.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085176840c6f---59640137689.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b57b5ff6---zojeruj.pdf
    • http://strahovka66.ru/userfiles/file/99838414793.pdf
    • http://hoangle.vn/uploads/userfiles/file/kovenowi.pdf
    • http://botosani.ro/img/uploads/file/92002175757.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/954f592ef9f15d97cb0753d01190d416/dodusolofufelodoxujetob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+the+challenge+vendettas+online
    • 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_off0000e0a2.bin
7038a50e243943dfd33996b0c739d7ba807ba8e4adb3846113dfb1c8856ed234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 5180 bytes
font_01_sfnt_off0000f250.bin
4b4ded712faefd5f5ffd20fcb318c420baaedb4b0fa160f876fa5ff73ce7c82f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 12020 bytes

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