PDF malware analysis — malicious · c8c43ee3810163a5

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 10:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: de3b28a4bbfacfa9b0b43acabb3214b2 SHA-1: 2968d0870bd77f3dfe508b4acfdad9b06ba9fa17 SHA-256: c8c43ee3810163a528ab259af9840c41aaece861c03f474534ac655425e401b2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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://medvor.ru/uplcv?utm_term=assassin+creed+na+androida PDF link annotation
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8b567e0b---jenufimegewuxewuzanajevus.pdfIn PDF document text
- http://www.badischer-kunstverein.de/ckfinder/userfiles/files/fujudameg.pdfIn PDF document text
- http://yourmoneyyourbank.com/uploads/File/kufizonepadagetemebi.pdfIn PDF document text
- https://himalayanespresso.com/espresso_ckfinder/userfiles/files/11262814934.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uukp7cutpfndtisjndk6g9u1oh/jititepemofodiripiviva.pdfIn PDF document text
- http://shahnawazonline.com/uploads/files/9036098973.pdfIn PDF document text
- http://greddy.com/admin/common/ckfinder/userfiles/File/xepekapuzuboj.pdfIn PDF document text
- http://health-bridge.in/upload/file/18230041054.pdfIn PDF document text
- http://tdjl.com/uploadfile/file///2021090605055322.pdfIn PDF document text
- http://fivelscope.net/fckimages/gomuterojegoxipofijog.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fc436abq1jjok33rchsup67p5r/26106800230.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/62a04a23a282bc97f53ed84fc683e2aa/84202289641.pdfIn PDF document text
- http://bilcafe.it/userfiles/file/kinebodog.pdfIn PDF document text
- http://kleinschadenexpert.de/userfiles/file/91617475651.pdfIn PDF document text
- https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/72027573773.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613736bc1fc36---zabalifiduronufo.pdfIn PDF document text
- http://hk888.edo2008.com/com/comimg/file/20210909_005626_167.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210904115538.pdfIn PDF document text
- https://inunekocp.jp/mailmagazine/upload/files/lebijavufolirebori.pdfIn PDF document text
- https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/4631764695.pdfIn PDF document text
- http://bensonlandscape.com/editorData/file/13907102636.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/71805170475.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300cb909b43---94554254819.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c156e2a86---98373134762.pdfIn PDF document text
- http://pibar.tw/uploads/files/202109050018284148.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391717ed584---pikiganozaga.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bf86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF86	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d798.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD798	16936 bytes
SHA-256: `b6e779c6e983e8059d054f4d4b15ae69fd9abbf41c101274fe376ad81e64e79f`
`font_02_sfnt_off0001037a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1037A	10200 bytes
SHA-256: `54bd2f6674c1f09bb8496896222c6d9b63c55e67f3c95a47bb2967cde1d5c9b7`

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