PDF malware analysis — malicious · 928628f23e357a64

MALICIOUS

PDF

100.3 KB Created: 2021-09-05 08:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9b0a0a75e3342d3a630125d7719a5864 SHA-1: 5f288d0227119a100284a687b69b7c9ae775bec3 SHA-256: 928628f23e357a64a9d36be1e76339ca1784a6f9409f3d0ed89e3fbe49fca300

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrusted domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to obscure the true destination through link manipulation and disposable hosting. No scripts were extracted, but the primary attack pattern involves luring users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/evu9nsr14a2f9i0oqhopqhnq1i/39441631401.pdf In PDF document text
- http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/7989572147.pdfIn PDF document text
- https://micast.de/wp-content/plugins/super-forms/uploads/php/files/l5ftcnshkf73aqjlq0oai6cso3/detute.pdfIn PDF document text
- http://divorce-difficile.fr/userfiles/file/60520552591.pdfIn PDF document text
- http://www.ufolep-69.com/contenus/files/8304687465.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gsbfi9qvfno6e6ivpb5hh6pn15/jorato.pdfIn PDF document text
- http://crystaltrade.hu/data/file/pixexezerotis.pdfIn PDF document text
- http://vinhthuanvietnam.com/upload/files/32116437151.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160844055ebcba---wedimodisezigotedezuxitoj.pdfIn PDF document text
- https://limpiezasinasel.com/userfiles/files/82307804169.pdfIn PDF document text
- https://amoslodge10.org/ckfinder/userfiles/files/jikupemufuzumusikoxap.pdfIn PDF document text
- https://geneticapanama.com/userfiles/file/93218996621.pdfIn PDF document text
- http://teleinwestor.pl/userfiles/file/71180346414.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43f5e2049---piropo.pdfIn PDF document text
- http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/25125718908.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6781bf2ad8d02cddaa840a47be56ec33/54302775416.pdfIn PDF document text
- http://ncabhsa.com/clients/875427/File/33940732161.pdfIn PDF document text
- https://asiabiru.com/contents//files/dudebusozowotevejuwudez.pdfIn PDF document text
- https://amd-export.com/site/upload/file/bebabatuzomifimonu.pdfIn PDF document text
- https://gancza-yacht.pl/userfiles/file/sodosuguvidopefobo.pdfIn PDF document text
- http://septumdent.com/img/userfiles/files/8038174751.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d018757e59---sebez.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/5829776004.pdfIn PDF document text
- https://fetogram.com/images/upload/files/penipo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dodow+instructions+manualPDF 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_off0001202a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1202A	18968 bytes
SHA-256: `b35497fdff1234f914574a1db6f7e0b141e6bbdc446cb6af52341e7ed2ba2129`
`font_01_sfnt_off000151d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x151D6	10588 bytes
SHA-256: `bfaa4c10dc32a01ad9d63dc86a051285a7e0c3cae300fccc8f93cb038cbe14c2`
`font_02_sfnt_off00016a0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16A0A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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