PDF malware analysis — malicious · fa7d6ac6399274bd

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 01:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: b536f9034c306e718da94f64c6e6dfb1 SHA-1: bd0c718b93e8e1d32c09e97cb0d32e3ebfaf9406 SHA-256: fa7d6ac6399274bd6bc2da9f3f6a9993dcf079a1e86ee83c9a1677ceccd764eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://jmk.kr/ckfinder/userfiles/files/88123398351.pdf In PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/62b3f28450a72414b7cfc855a93b5b1a/96151187036.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/folazunemenaxup.pdfIn PDF document text
- http://terminsk.by/pics/files/tijitajimefikebafedugowug.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a972edfa9---23125720015.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3b3bbb1037211483108de9ba80869023/65760646217.pdfIn PDF document text
- https://ecpa.fr/uploaded/file/wufasinegosuzotigebanijug.pdfIn PDF document text
- http://bhhangkhong.com/upload/images/files/1395794119.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/guvof.pdfIn PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0c834419d26cd7f9207e6941ccdeaf54/88195614497.pdfIn PDF document text
- https://whatshoulditcostme.com/userfiles/file/sovulawo.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c330957ddb3---rinevasinazosowikur.pdfIn PDF document text
- https://alves.bg/ckfinder/userfiles/files/lujejipogawivanakene.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9af9a14e0---65150312209.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ca418e34---wabifeb.pdfIn PDF document text
- https://mrdak.cc/uploadfile/files/pegizadad.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0742adaa6e773239db4ae5bdb93743ba/25566750237.pdfIn PDF document text
- http://studioingtassinari.eu/userfiles/files/61012974767.pdfIn PDF document text
- http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/82048977551.pdfIn PDF document text
- https://magiccat.pro/ckfinder/userfiles/files/65588321074.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/55393d48f7ea92102df38dd4c644de68/temalifum.pdfIn PDF document text
- http://asokmontridental.com/userfiles/file/81231332877.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/cvd7e779g3ed9g3mhae5444o97/12889135504.pdfIn PDF document text
- http://ixtvs.de/_upload_bilder/_filemanager/file/belodikeb.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8d7bd0d247bf552be22fd0bc7349b284/1737086447.pdfIn PDF document text
- https://grandegroup.net/files/34723882573.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=differences+between+science+and+technology+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_off0000d9ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9CA	16716 bytes
SHA-256: `59cfec438fbd97f8d365ddfba341f4cfecd60a4f95a64d30816cb3da9209b959`
`font_01_sfnt_off000104b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104B5	11240 bytes
SHA-256: `b83bc4dafeb52cbca51680ebed79cc62abc2e8d21332d9c238ce1248fc34b5f9`
`font_02_sfnt_off00011eb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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