PDF malware analysis — malicious · d842666b3c508a95

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 23:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 352d469ce91680bba901b37b199deff2 SHA-1: e3a060c79c58682e6c75d87af1fc688aae19da2b SHA-256: d842666b3c508a956355f81ae0eb8f2447e0faa9457572b2183844ffa143c9a2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://queure.ru/uplcv?utm_term=operational+effectiveness+pdf PDF link annotation
- https://egyiksem.hu/uploads/file/6407523928.pdfIn PDF document text
- http://hanhthien.net/uploads/file/nusonofum.pdfIn PDF document text
- https://ijieet.org/ckfinder/userfiles/files/xizorifuxirulopumerir.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/uhs6jl37ui7krord969p9fbbca/17166790978.pdfIn PDF document text
- http://baraanduliaptti.org/userfiles/file/74312598535.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a1823a7f9---89230647391.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd58f1de8ce---lojuvoj.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/06c2d00b35d28cae97f70359b6b4cb11/berumegegipufuwog.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/353d0efcd437a00ce35a2746846b67b2/24374761301.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607baddf8ac76---ritovosilizagusodifufabos.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/lveg3b3dikadiqkb7332i8fo26/rilubexanudakunude.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/baa13e232d9315603e4bc6472c15582b/jugaraxilizog.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/7158436344.pdfIn PDF document text
- http://jia-longsofa.com/uploadpic/jialong151126/files/202108192230271540.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161174fef77852---jifubidol.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/380bbbdb8ba78054baf054cfa887d86e/kabozon.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/sos21em3j21i0divp684gqbdch/giroroleravozamuw.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/mixumupulegetolulujawarox.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d00a7db17fe---nuxesukinefola.pdfIn PDF document text
- http://446888.top/userfiles/file/maxabufuzavigovipewetene.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9fa1dc750051006c76af19e60dc57d6a/zitalokabumowomalod.pdfIn PDF document text
- http://atmaircenter.com/lb/userfiles/files/jazufebavatud.pdfIn PDF document text
- http://alliusie.com/userfiles/file/82094041437.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc1d2dd91---jimorumalunafumuzabob.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd24a7478---77869828237.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_off0000c7f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7F6	10704 bytes
SHA-256: `661c05dfbf4350a140f27946db96acb48f4f07ce19e32b0df0933a4f806ae6fc`
`font_01_sfnt_off0000e0ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0AD	17184 bytes
SHA-256: `60e22a44a26e52b978c2c33efd252b0228fad81ba983aaf3532664138f51b8ce`
`font_02_sfnt_off00010d04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D04	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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