Malicious PDF — malware analysis report

Static analysis result for SHA-256 4687c110ce8a81db…

MALICIOUS

PDF

109.5 KB Created: 2021-07-26 14:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf5b877b9b30875fe41d5a99476232fb SHA-1: f8e363480cc34a4c938eb04718a819893fe0f626 SHA-256: 4687c110ce8a81db3d93e2ece64bd3e4db59a1ca49190e0726c655a78cd84aeb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting users through these links. No scripts were extracted, but the structure itself is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4npb5gdempjh146qgq8ocmgi14/guvagogexarafitegidivipez.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607430cfc73a6---zerumubonasilutebesax.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607055c29336a---gipirifipekopabevugup.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/2365462409.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609134e23496d---bugejawibukotoz.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/03a97ceb21e530dbcc68759d5b39fc4a/30496941776.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/20d14c97c30fb6d8d3e7e033b9fba40a/15356293639.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/vujabeni.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/8999332812.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/839cfb48617cdaccfc7a43bb10302498/15452212609.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/87e28081879624683899e41f5cad10e8/lupibixojefupajomem.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/28c94ed21495f71d42a9111a33a209d4/zejumituzademadovagofosal.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/92l62dii454a7u279pjd2d3an3/88516064946.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/56f363a7f273c52bb4c80dc9a0344e39/xuvula.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/24617567913.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-29/20210629101628174807.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/55744369772.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/16758927540.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/68548836953.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/28403952716.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c510543e030cc07af47c6989efda38d9/86994912197.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b530f3713---tonuwutitumetawiba.pdfIn PDF document text
    • https://superpart.com/files/2122421988.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zapaxirutavajori.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/354b410522a450256860babc193264e7/zaborev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=jacksmith+hacked+unblocked+games+66PDF 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_off00013e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15674 11208 bytes
SHA-256: 8f93e191787c7c7968ac915d4128af1e5c08fe85a43b5ace87b9ceeaf3516423
font_02_sfnt_off00017050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17050 21540 bytes
SHA-256: 982c237ec83fd6473d114e4f30b9416543dbd8901bfaf15f39e50e588c18b9a9