PDF malware analysis — malicious · 2e760c218e3451ca

MALICIOUS

PDF

96.8 KB Created: 2021-07-05 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 8dcb29af3a3af1468dddf7703805aaf6 SHA-1: 09348cdf5cde59024c06c96429998ea44bf60f83 SHA-256: 2e760c218e3451cae3f8c1499bbe7c7d2353848ee5f47cb19805491a67f016af

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and the presence of many external links indicate it's likely part of a link farm designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9747

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://pistant.ru/uplcv?utm_term=structure+of+nylon+6+6+polymer PDF link annotation
- http://hitecds.com/userfiles/file/fanotakutifeme.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086778fdbb69---xufanijagojete.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045aee2d42---buxadis.pdfIn PDF document text
- https://auto-rujo.com/images-editor/file/wikapaxejulijilewekorazu.pdfIn PDF document text
- http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/66400779194.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/egilunog9of1aag2a45qje3648/64650739621.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdb9d4f587---57687144866.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ghlvcjph5o15bnipo7q9hpuq0i/nuwofovidoxisi.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/lofamuxu.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1dce6b71fad5ad07af6150ca5c94b931/moreketipiluxosituripijaw.pdfIn PDF document text
- http://younewstoday.com/task/userimages/file/83218002106.pdfIn PDF document text
- https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jat39st2hco8ro8fr0douuj64p/xumuxupo.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/46ve7es0rg299m0es8k7bmel8d/91120341453.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qkrarvtd57mtba407bj2lgoa0f/5494993844.pdfIn PDF document text
- http://tiramisu-o.com/yamituki-n/uploads/files/tewetatuzaxupixanezina.pdfIn PDF document text
- https://advance-pack.com/editor_upload/file/2202319321.pdfIn PDF document text
- http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/83288642329.pdfIn PDF document text
- https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/e3cf88d25638d9cf7259beb5227b74c7/lofajawoperixozeperanun.pdfIn PDF document text
- https://autosaloncenter.com/uploads/file/2327149016.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093aed711c72---16038350774.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/3508628044.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c1d390ea6e25cf965e694e847c77f751/82234273957.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/81f129f93c12c85a9a507c945100e74b/xiladeget.pdfIn PDF document text
- http://soft-pro.hr/upload/datoteke/57511215091.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/dujugitagaravaratun.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c8112e86f32eef5ad7afbe0b5cc1b913/40539469422.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608351d0b0375---tomakesosenisut.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ff75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF75	16060 bytes
SHA-256: `79f27ef1bf85ca6c198d098614f2f622ee7798d500390a76c2468bf998b64bfe`
`font_01_sfnt_off00011481.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11481	18464 bytes
SHA-256: `c51568bca7f57082e9df58e4954fb396db95d8ec57448c396fd089cf8b0e925a`
`font_02_sfnt_off000144a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x144A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015cbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15CBE	10676 bytes
SHA-256: `1cece8caab49d4780f866a1025c3dc3240f2264f5cd06cbf1cb5c533be2d8b2e`

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