PDF malware analysis — malicious · 3840e2d3d46f12da

MALICIOUS

PDF

94.0 KB Created: 2021-09-07 14:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 6102140a348ab9e6467534d97c0189a2 SHA-1: d57fa58eb358e07b369cb200598a832222a04bbe SHA-256: 3840e2d3d46f12dae79cc5487daf72d5261b739280e0494cf2b1808357fc4600

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and a link farm heuristic further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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 http://yanartextil.com/firma/files/9053905823.pdf In PDF document text
- http://wannawwannie.pl/userfiles/file/zagumuwupezowuj.pdfIn PDF document text
- http://ecolservizinettuno.com/userfiles/files/27449932889.pdfIn PDF document text
- https://flexi-cms.com/uploads/file/sijepikulozinudonubalut.pdfIn PDF document text
- http://119pump.net/d/files/34362760725.pdfIn PDF document text
- http://skogsformedling.se/bilder_umeny/File/bipotefubaseruwefupix.pdfIn PDF document text
- https://demircanticaret.com/userfiles/file/saxurovezo.pdfIn PDF document text
- http://austria-ex.com/images/blog/file/lixoxoremekite.pdfIn PDF document text
- http://ecoaga.com/documentos/file/94131942582.pdfIn PDF document text
- https://www.padanguparduotuve.lt/ckfinder/userfiles/files/wozixufuperevufapilowagu.pdfIn PDF document text
- https://suacuacuontoanphat.com/upload/files/pajopofurobibosog.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/67m39ktbupepbp5ocnbka7ihrj/70137907232.pdfIn PDF document text
- https://mandarinkinesiska.com/userfiles/file/70036086281.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/26e25c5036bc05f81e00cdc9e7bbc426/92679191652.pdfIn PDF document text
- http://smflow.in/admin/uploads/file/sabumu.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de1e3ee1c---5812192334.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d885d427aae36d3798b147d9bf3d3b34/48093752641.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8r04jsjug447lhv4jbtorq4bhm/28615275236.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3890f3a28a---23721089636.pdfIn PDF document text
- https://appfacile.it/file/bulejebuvokiruteni.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/50sniuqqmemd47dodlftg3vsm7/30381311360.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d49a06f1---88241674929.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7716c29e---81331604422.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8348ce8ae844f234da06ee816566dc21/dotujuxo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=arizona+landlord+tenant+act+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off00010afc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012313.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12313	10488 bytes
SHA-256: `878b561004e67af8d0bee37beaf0c5957699173e15d05896a4c0b605a17483f5`
`font_02_sfnt_off00013b08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B08	18056 bytes
SHA-256: `daee995a49614a3712d3140fddaafe6388cba796d1df916845fd8c0a5ab811c4`

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