Malicious PDF — malware analysis report

Static analysis result for SHA-256 b527810511ee8530…

MALICIOUS

PDF

76.8 KB Created: 2021-06-21 14:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bb60258e7b68206945d29a0a539296b1 SHA-1: 1ddf320cf392e4e23f1b7a51d571fd4e5318358f SHA-256: b527810511ee853090e21d337059f2d8589898ba70ac08a64246128ee8c26a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to numerous websites, many of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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 https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0c674be6995bf2fbfa5ed0531310cd34/mubadajamemaso.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/10982890652.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/49354138299.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tasexewapolovejajekezuk.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c2324b819cc3973903f0364a9d5ae616/52329114465.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160793c965577a---dewobuzazegisexafemif.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ifgfsbd5s0j2gmfoosmt1u2vq6/59647785602.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hq5bb9lqm85s74gqm1alr2beip/88630643304.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210516214341.pdfIn PDF document text
    • http://araonline.hu/uploads/file/71246020200.pdfIn PDF document text
    • http://liyangah.com/Upload/file/46227303754.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ea290bd18---66198366986.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c182cea81e---xevineregar.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/52279199904.pdfIn PDF document text
    • https://avenue102.com/uploads/file/topuxigopaxovevexigakez.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/molipudabuwaputadafiwa.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gatexaxapuxof.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e087f2929e---49220755071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cinemavilla+malayalam+2019+moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 5284 bytes
SHA-256: 7bbb1cf123dbca9cc3b184ef2554e7e9a5100f8cd3dac2170357a21168858bc1
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 3396 bytes
SHA-256: 0396fa63a492089f1df2646d5951000793d4e3dcd785437749dcce0730e5d695
font_02_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 11360 bytes
SHA-256: e90948f56bc14214650476e08df88408385305f739b3793618c8c03bd7e7194e

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