PDF malware analysis — malicious · aa21267185f08e4a

MALICIOUS

PDF

88.1 KB Created: 2021-07-27 15:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5e20b2da55b567157ced77ab362e3bed SHA-1: 9350a838ec02725fc3d91c16b66db0ddd057525f SHA-256: aa21267185f08e4aba4bdc371d13117645ea49af42386e613cd8a3968f35b6d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://rivnerun.club/images/files/losodedikifewitenat.pdf In PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf416b176---57115580505.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dd6e2cf2---rosudofubujifo.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075975230872---76988280666.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d1e30c5c---16870831491.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c901d3a194---jemifumisedokobiwinaz.pdfIn PDF document text
- http://navigator-33.ru/media/file/lomera.pdfIn PDF document text
- https://noddy.nu/images/file/datenadigitapezexaxa.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/rinew.pdfIn PDF document text
- http://npi-management.org/ressource/site-image/files/wunobapajod.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088c51aa74f5---19044465747.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/421fb9a717b1b516ce231618b9ccfab3/bogokilal.pdfIn PDF document text
- http://kgmda.com/upload/files/7445774238.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080d93e52aed---visokekumewututuvukir.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082455e05170---fejibesomuponamejebu.pdfIn PDF document text
- https://hijaulumut.com/contents//files/lelomunivedomazijazi.pdfIn PDF document text
- http://aliglobshop.com/userfiles/file/85470657273.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/32413274383.pdfIn PDF document text
- http://dobrejaja.com/Upload/file/pevatasoderupe.pdfIn PDF document text
- http://aplus.to/userfiles/file/22168132837.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/36062146359.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/i1lgrli4ql380skmrnu7e55jk6/batuvipawawegibumi.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tq930ahjv862r95vjtq3o61bt2/52882521322.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09bf47d079---18989454571.pdfIn PDF document text
- http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/23257350153.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a122eab2ee6---94172273485.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+connect+hp+printer+2620+to+wifiPDF 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_off0000f5ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E04	10688 bytes
SHA-256: `48f97a07219d3e8acd0972f1d26be1f88a990efd5b615414b2faab8d92d53a03`
`font_02_sfnt_off00012676.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12676	16816 bytes
SHA-256: `a88c9a467cae2d3726cb0eb02793a584b1068cf9c33a61c43a8ce7c31d07060c`

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