Malicious PDF — malware analysis report

Static analysis result for SHA-256 08572f4772230489…

MALICIOUS

PDF

74.3 KB Created: 2021-05-25 17:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7888ca4fd7eb6ee157b49bd36d7f7b09 SHA-1: 8cd0e3931d4506e7c7d2e01014d3d4540c56cfd0 SHA-256: 08572f4772230489e1000ce7abd5ffa3cfa4fb242ccd2f10ead6ed8ea65ab8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress sites that host further PDF files, likely as part of a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results for malicious distribution.

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89095e567---rawewuwoxibubawo.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0c4270c960306ab4c00dc7f83c3f8ee4/sasedeweseturobanigenotuv.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba35496bce---72022823725.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc0686956---puzori.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927b6be0814---80973718609.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16070777841d57---wafikanojadib.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452b7abe00---9342881108.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b9d876c2b19e7aaba66f624e3f6b6047/72172555884.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/641c7fd687c0ba31dc40a39edcd50689/refazexukoxuzodevofopot.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uoqqb2i3poor280ibjuk4sd04h/69425327996.pdf
    • https://aslimitada.com/userfiles/file/vapuvelom.pdf
    • https://kopari.hu/files/file/21448932880.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b3a1978e9500d1ab13bf3ff57ea8f9d/34757614916.pdf
    • http://www.urbanwaterways.info/files/xemovudejoxok.pdf
    • https://hosvagyok.hu/userfiles/file/83888608620.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a494e85aeb7---lovaxagegofoki.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qn3iaet0udgo1q96kbruj8eee3/17183016317.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=livro+thiago+nigro+pdf+download
    • 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_off0000e098.bin
43631d26f249d7cf3e08b54af5f12c298cb44a8a1b8d2c582c73010b648de18a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 5220 bytes
font_01_sfnt_off0000f274.bin
0d57b83903c7bf517cb8e8706a7e302551e5744dde97f8096a5137c863944759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 13380 bytes

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