PDF malware analysis — malicious · 83fbd0acf1c616ff

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 13:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 12fe6ca09cbbe2b3bca4c0416e870655 SHA-1: 95754a617500ea560ae4245f805ea569ea7007ac SHA-256: 83fbd0acf1c616ffbbdb13f628f054780a51c2b40e533f7ee22cb7ea9f65eedf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links indicates a likely attempt to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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://archism.ru/uplcv?utm_term=tarsem+jassar+new+song+punjabi PDF link annotation
- http://symbioticlifetech.org/attfile/fckimg/file///20210908224549_46322014.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bfoa7gr5pct0miot6p39rus84h/zuvonefumivofanexuna.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad181a36a---32475694222.pdfIn PDF document text
- http://keifo.ru/ckfinder/userfiles/files/90308857705.pdfIn PDF document text
- https://highfieldhousehotel.net/nbloom/fckuploads/file/woxixubenaniwatiteliku.pdfIn PDF document text
- https://hostsolutions.ro/app/webroot/files/userfiles/files/jujuzoxekaveg.pdfIn PDF document text
- http://schuetzenfest-hemeringen.de/ablage/userfiles/files/nanemidopavew.pdfIn PDF document text
- http://architettosirocco.it/userfiles/files/dokerit.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161325c8cc54a7---64034038882.pdfIn PDF document text
- https://tsydesign.com/userfiles/jws/files/2974602890.pdfIn PDF document text
- http://bud-drog.pl/userfiles/file/61495634040.pdfIn PDF document text
- https://cuatudongsaigon.vn/uploads/files/juzonofotulepesegeduvejid.pdfIn PDF document text
- http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/80724042018.pdfIn PDF document text
- https://qwert5.com/psum/admin/userfiles/file/zaberisosugedaferuxefig.pdfIn PDF document text
- https://studiovizia.com/webroot/img/content/files/ketamapituxiladefimujajus.pdfIn PDF document text
- https://laplacedesstores.com/upload/file/laditovase.pdfIn PDF document text
- http://maksimetall.ru/files/41477976817.pdfIn PDF document text
- https://vanchuyenduongsat.vn/upload/files/99146314383.pdfIn PDF document text
- https://wcfkenzi.com/ckfinder/userfiles/files/8772142164.pdfIn PDF document text
- https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/varujagaf.pdfIn PDF document text
- http://camberwelltaxi.com/survey/userfiles/files/wolegifuzutizezele.pdfIn PDF document text
- http://slavutich-media.ru/userfiles/file/61577007445.pdfIn PDF document text
- http://thegioicamdo.com/upload/files/8128066152.pdfIn PDF document text
- http://ranjitabiswas.com/userfiles/files/linuxekumodonigu.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373822129f3---22117505576.pdfIn PDF document text
- http://tiquital.com/documentos/file/63869578874.pdfIn PDF document text
- https://trvstore.com/userfiles/file/ronawenutom.pdfIn PDF document text
- http://pk-rowery.pl/user_pict/file/kevofaxefojituxib.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_off0000bf78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF78	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d78a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD78A	17524 bytes
SHA-256: `be9cdc70c6a39d592c9eed26030e17a92a13a0d3ba115f368504d9bffc828918`
`font_02_sfnt_off000104a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104A2	10868 bytes
SHA-256: `445fdb5c6a57bb839c8a3eda3ac831cacc60458b9bbfa6c3dad4af0028bcceec`

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