PDF malware analysis — malicious · dd864d66e931a7ba

MALICIOUS

PDF

88.0 KB Created: 2021-09-07 19:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 259797dd309afcad03954c303c32be2e SHA-1: 1d0cef87090d5f69e34e383260a89be6791671bb SHA-256: dd864d66e931a7baae9bfa7724456abb2a909d31296ee2433df81bcdc185bdb9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=integrated+transmitters+and+receivers+pdf PDF link annotation
- http://ever-pioneer.com/upload/files/57376770353.pdfIn PDF document text
- https://nothingbutsafetyglasses.com/userfiles/file/86251737554.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/lalefedupoviwaf.pdfIn PDF document text
- http://kokocurry.gm/userfiles/file/32757383858.pdfIn PDF document text
- https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/e3fae6dacc3c86a4e8443d6a3785657c/fapinepakizemuw.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ncsug8ddpbe2oeu1tf8fbd3jg1/falumemesexibagidujapos.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3b4ad51541ffc24c5a8fb0f7dd00248b/93539627456.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801e965e65---53311976111.pdfIn PDF document text
- http://techbico.vn/uploads/image/files/55479928188.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d9f3f07e---nurisafokifogino.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8f5542456b125483cde988b711d9793f/jupesumemiwezabem.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ns3uka4h1cug0gjqb4emj2lk4n/91642054772.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7d7c6ee042396b0cb267d850077176ff/vetufulav.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/495a49e12795a63a6a82c3fa800160ab/senelupe.pdfIn PDF document text
- http://unibox.lv/files/text/69865525616.pdfIn PDF document text
- http://watsonwilliamsreunion.com/clients/82103/File/lawugixixapo.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/neeaerh70hfpq50tu7rdpkm115/wobukakin.pdfIn PDF document text
- https://felicityokolo.com/file/daxitivibofagulaliga.pdfIn PDF document text
- http://nissanotogovap.net/uploads/images/files/gazawileg.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0a75143f---jafaludakepalujusoxumamam.pdfIn PDF document text
- https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/tkje2ql4rtrkh5ac67r6rdvbq8/xiwapureki.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/69s85rmjmkab191e3b8uj5vuab/53816926859.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfaa56824---5874517039.pdfIn PDF document text
- https://zegaoyun.com/calisma2/files/uploads/41431090275.pdfIn PDF document text
- https://stvorki.ru/files/file/28076019119.pdfIn PDF document text
- http://cesurmakina.com/userfiles/file/6171590832.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_off0000f45b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF45B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C6D	17372 bytes
SHA-256: `1cc60663504f74cd18e76e5c9d8f1b15291cea3b4a705f4c8afc32563a0abea7`
`font_02_sfnt_off00013976.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13976	10812 bytes
SHA-256: `6403b09ce6e4dbb56fee31d439e655e7b54af00454fa78ccb9cc93acb9fd2f48`

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