PDF malware analysis — malicious · 6fa4ba3a711b32b0

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 01:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4f295e33a93f4f28d363a886c4bd6462 SHA-1: 92f19dc7048ab340469a05afcad61fc71e912443 SHA-256: 6fa4ba3a711b32b0d78da73d3374985bcb8df186c2dc26fe1a872cf9419a35c7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised domains, suggesting an attempt to lure users to malicious sites. The presence of JavaScript and the link farm structure strongly suggest an attack pattern involving redirection for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://radekslodkiewicz.pl/files/file/85607711516.pdf In PDF document text
- http://ipea.kr/userData/board/file/wamesutuzu.pdfIn PDF document text
- https://dabanbep.tanglehadong.com/upload/files/47097532494.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140664a571b6---67622091060.pdfIn PDF document text
- https://mimpishiodua.com/contents/files/16328127402.pdfIn PDF document text
- http://bmfjhjk.friend-match.com/upload/files/2935403907.pdfIn PDF document text
- http://artvideo74.ru/upfiles/files/dafolenuwujidaxewif.pdfIn PDF document text
- https://khanoomhoteli.com/basefile/khanoomhotelicom/files/44334594126.pdfIn PDF document text
- http://topnotchimports.com/ckfinder/userfiles/files/6122458134.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/kegipe.pdfIn PDF document text
- https://cottingham-group.com/cufiles/files/78097396325.pdfIn PDF document text
- http://eva.am/files/8978a200bf9683bf.pdfIn PDF document text
- https://gameadvisers.com/js/new/fckeditor/userfiles/file/7987419707.pdfIn PDF document text
- https://srinivasagroup.com/ci/userfiles/files/39103436142.pdfIn PDF document text
- http://bakefruit.com/uploads/files/202109100431193358.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d4c36364da1d46310b1e1d722e90983f/savomufewedijelosoguzu.pdfIn PDF document text
- http://futurepoolandspa.com/ckfinder/userfiles/files/16748844680.pdfIn PDF document text
- https://mytopics.it/uploads/file/71264275282.pdfIn PDF document text
- http://colokit.thienlonggroup.com/Images_upload/files/30756979792.pdfIn PDF document text
- http://straps.by/ckfinder/userfiles/files/74675815392.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4c92db15f---84243514528.pdfIn PDF document text
- http://chanakol.com/ckfinder/userfiles/files/kenazogafogu.pdfIn PDF document text
- https://penzion-pod-rozhlednou.cz/img/file/kewokid.pdfIn PDF document text
- https://eol.org.pe/ckfinder/userfiles/files/4271399576.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/masenipufujewuse.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=seo+keyword+analysis+freePDF 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_off0000b429.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB429	10616 bytes
SHA-256: `7add84ca81470ecb095e367ee5974fc9962a866264fe4cf9090265a5c969950c`
`font_01_sfnt_off0000cc92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC92	16260 bytes
SHA-256: `53af4d3b71415aa8af4736887efbb1ee24a741265b9d4e0a06d16a16b4985591`
`font_02_sfnt_off0000f57f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF57F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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