PDF malware analysis — malicious · 92c4bd8000c18621

MALICIOUS

PDF

81.5 KB Created: 2021-08-07 04:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: dfe497a49b6d87a8cf85cd35e0da17dd SHA-1: 851a6f44888be67d942b0f636a16d1fac16a2c39 SHA-256: 92c4bd8000c186213bd16c44cfa64bb3bf0bc5a1ef678879033cbca4797cfd05

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious content hosted on compromised websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=alien+run+3+unblocked PDF link annotation
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8c288f34---judugewokalaxorikokelos.pdfIn PDF document text
- https://myphambambi.com/webroot/img/files/mekanuruxil.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-6-27/20210627124541884075.pdfIn PDF document text
- http://bugskin.org/userfiles/file/84581465454.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/28a3af36df7a23a60e1b383015b6b94f/kilopitibuzemil.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587ec29cba---97407662752.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2a92581259c680356273d2eb535bcf96/kikaxokigopulajoxexug.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7037d4249---68833213492.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/mumexokofujukezurudemop.pdfIn PDF document text
- https://liur-krd.ru/userfiles/file/39564162289.pdfIn PDF document text
- http://all-pass.com/folder/editor/file/pubefokinu.pdfIn PDF document text
- http://parkhighclassof60.com/clients/871169/File/denufibalawerezexivagivu.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6cd8d905---livobabat.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfabfb447e---42131735903.pdfIn PDF document text
- http://okudshava.ru/userfiles/file/jatovalizibevamokaga.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cff48c45---7505319104.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cef2763c262---91842544644.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1055da6e7---putem.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ccc44cbf636305265df8ed7282d75022/nalutujediw.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895d6e39fa---ralogorarolu.pdfIn PDF document text
- https://psychologgia.pl/Upload/file/setilabipimapaf.pdfIn PDF document text
- http://elazentrale.de/images/uploaded/file/80154495052.pdfIn PDF document text
- https://dolmalatrek.com/userfiles/file/bigapiwenetipukop.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac7a1b4b8---32362500293.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/03ff73feb11a39cdaabe65838119ded6/jikepatudojupoba.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8g39jnh14djb8lms00r54s9ast/37435022379.pdfIn PDF document text
- https://smilepaper.tw/archive/upload/files/xupipixalujeliwubulakivon.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD9C	10420 bytes
SHA-256: `aeef099f9ed080d51cfebe2a2f929d711864becaebec58f6227fa695c8f28e63`
`font_01_sfnt_off0000f54e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF54E	16632 bytes
SHA-256: `8038c9aae879decdf3e77e437d66a59d75c604831b69b8c6871290281a8e5726`
`font_02_sfnt_off0001204c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1204C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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