Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7c222c61b711e1…

MALICIOUS

PDF

77.5 KB Created: 2021-06-19 07:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 828cb6242a36dfd3048019f9807fb1f4 SHA-1: 5359b345d9cc96e757fa4eca10dea3dfec5e3911 SHA-256: 0f7c222c61b711e189ac4bd9b1091e71f154c5acb8672dca036f86e5aa8879c0
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, likely to trick users into downloading a payload. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://novussiteyonetimi.com/uploads/file/49644772303.pdf In PDF document text
    • https://papiratisk.cz/soubory/vidatedodidototegepekakep.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5be7c4abf4---67465065857.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d089fc85f3---vitulozewilovinuxelimuvet.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/75335307337.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48e0a0b317f7b59a73d1e6d8b791e1e0/89831937396.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4b426fe264032a83a33571dba3787ab2/42291005783.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a68b2ab0237633929851797c91f3e76d/kijuxazujimaxesuxamavope.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/74635925682.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084381c203a6---rimonefesifamebunap.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc11ae2e6---20684358156.pdfIn PDF document text
    • https://yellowstonewildlife.com/56025484009.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/50753203201.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/146212ccfb49a7250b61ad16fbcaf789/xizup.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/24925223420.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae04c8f71---32856427668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ringtone+crazy+frog+axel+fPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5096 bytes
SHA-256: 8c11b2b9bf609fcf8aeed5d52ea63e3804ae346426936e2d536f7b6dcdeb91ef
font_01_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 13408 bytes
SHA-256: 3a7e775a0914ffcb4e138ffb56e7db8e802a6a41783144c39bf47ab2411515d1

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