Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c03692309169a67…

MALICIOUS

PDF

75.5 KB Created: 2021-08-31 02:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73e463545d1982b3597ae8df885d6ba3 SHA-1: 5e3d20fd07d5aee28165245cf3959c6543d1c710 SHA-256: 7c03692309169a677ba17ce355c960fe7380df14a055ef2b3a6785201c8e063a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f52f7b2387243d20c991ccf317f41bde/vubudedogarixosazin.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f33e7f17d5e16573854066157ca7abdc/91181483516.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7d11513dd56d29b524cd07781526162b/zurajiletekajekavesabu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/diwesazusapejimokaburafe.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88345762137.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/pakarigenokobebo.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/61028787669.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6f69ea1e96c4d909a0629c1b08c4204e/83068171126.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/xonef.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210811162868225562.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a2dd5876f69df71e218221c61e61203c/36810355490.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/57861405254.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/42452768161.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076b62f5661e---wolowuvudonuxub.pdfIn PDF document text
    • http://carbonelite.ru/file/gomativ.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sofaweb.pdfIn PDF document text
    • http://chromavials.com/d/files/89834615736.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/nijuluzunomisukademebe.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a013a622ceb---timufogarijivefib.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gugexebakasuliluzab.pdfIn PDF document text
    • https://bdata.vn/upload/files/69978714295.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/ximuviruwewarupime.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/pexofotesaworawiwitevajos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=perceptive+intelligence+meaningPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 10496 bytes
SHA-256: a3558f1ae7c9e5079487bb3d1a6ff5021948fc0b588177ce5e25144f044ea91f
font_02_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 18240 bytes
SHA-256: 83ab6a8f7304149b4c8df0c9ea317ef9e1ef9c3b634e75f35b4af088dc69c889

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