PDF malware analysis — malicious · 5231f16e65987148

MALICIOUS

PDF

90.5 KB Created: 2021-07-02 08:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 48d086183728f9e73d7706faceff34ad SHA-1: 458ae72309f7e7ad6019936c2d89bc4edca19b06 SHA-256: 5231f16e65987148eef05a234141a039bfa899860ccdbc35b68822ae0f1a6793

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those on potentially disposable hosting, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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 http://ateliergermain.net/sites/default/files/file/25327132825.pdf In PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4fdb1e6b5818f21b6d3354f250a7cb5/tugesifesanevuzubuzepit.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a247eba915---kiwesojepuvenawizexexuso.pdfIn PDF document text
- https://volgogradexpo.ru/ckfinder/userfiles/files/didodopamazoxa.pdfIn PDF document text
- https://agronlogistics.com/userfiles/files/51045617551.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019e11f107---26559752603.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/rulalamifusujujavugijil.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/82okepu2cjab3d31hb4dk5tdqn/pepabawegubinadobex.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36d755f12---dixisuleneke.pdfIn PDF document text
- http://everest-c.ru/ckfinder/userfiles/files/sarip.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3cfaca0b6d4fa09c414ec7c853b9b320/80894074945.pdfIn PDF document text
- http://clinicaveterinariabilancino.it/userfiles/files/bemunigapevolakimisu.pdfIn PDF document text
- http://shinies.ru/img/lib/file/pidifipaxilanulowesider.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728033ccbcc---jeworipiwok.pdfIn PDF document text
- http://bmcnx.com/userfiles/file/kalumu.pdfIn PDF document text
- https://tomas-music.com/contents//files/47784039756.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f8f19f47143e195e01270fd9faa6b315/vowuwinujutug.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/51465933680.pdfIn PDF document text
- http://yuha.be/_files/file/7343229804.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d062cd596dc75ccf961bd85d8d520015/finozaboxipagelolurelo.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa24fcf4aca8dc83cacb8426c90c5a5c/zeromikanibowififinufifa.pdfIn PDF document text
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ce76aec0---xupebanatiwol.pdfIn PDF document text
- http://gccde.com/downloads/blog/geust/files/25477143737.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/219b63ab27b56666ce9415a3971442b7/tumomem.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823cfa083ad---6704736324.pdfIn PDF document text
- https://aneri12.eu/res/file/xababazumokorekotasa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nuisance+calls+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001031f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1031F	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`
`font_02_sfnt_off00011897.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11897	17132 bytes
SHA-256: `a38b1e1d3db0ea7372825b252dfde35eeeba461180d718c9bcbeefb131c1a33c`
`font_03_sfnt_off000144c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x144C0	10332 bytes
SHA-256: `8069270bbe22fe21602ace1923ec216bf1b6f3d800900305f20202151dcbee37`

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