PDF malware analysis — malicious · c2ff87cc45c8d98f

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 05:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 18131ccfb2ed4b22f99a9255aac3014a SHA-1: 1fcbd58d95dbd0763b4722e8453d3c840c41df99 SHA-256: c2ff87cc45c8d98f3962d6e92db7971f265e3ad9e04e5da257665e95195b9942

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or distributing malware. It contains numerous external URIs, including one pointing to 'cructi.ru' and another to 'foodchemsino.com', suggesting it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a malicious payload or conducting a phishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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://cructi.ru/uplcv?utm_term=good+adjectives+beginning+with+b PDF link annotation
- http://foodchemsino.com/d/files/28268549696.pdfIn PDF document text
- https://myreply.mobi/snappshott/editor//file/mixoperagebagolem.pdfIn PDF document text
- https://idd.no/ckfinder/userfiles/files/47591699709.pdfIn PDF document text
- http://timavoshipsupply.it/userfiles/file/rigoralinakidelumabufu.pdfIn PDF document text
- https://facades-et-traditions.com/actualites/file/xegad.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16137218924e5a---73162126439.pdfIn PDF document text
- http://uniquecharacters.com/upload/files/46941193882.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/29389072088.pdfIn PDF document text
- https://dunaweb.co/bg_image/files/78493413931.pdfIn PDF document text
- http://briquettemachinery.com/d/files/mupimurutowefe.pdfIn PDF document text
- http://staractivecollection.com/resimler/site/files/37871360697.pdfIn PDF document text
- https://zegaoyun.com/calisma2/files/uploads/vitugoxazenolanewinajowat.pdfIn PDF document text
- http://kamennykoberec.eu/editor_uploads/system/files/selalujibuvemapegedejan.pdfIn PDF document text
- http://hide-bo.com/img/tmp/file/71274778226.pdfIn PDF document text
- http://tjsyjdq.com/v15/Upload/file/2021916175883112.pdfIn PDF document text
- http://hftyby.com/upload_fck/file/2021-9-9/20210909000743504431.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd63bbeef8---mizene.pdfIn PDF document text
- http://kmkonsult.cz/userfiles/file/86745149785.pdfIn PDF document text
- http://unibeauty.com.br/ckfinder/userfiles/files/57497935140.pdfIn PDF document text
- http://hyeminshop.com/DATA/files/reduvizabibavadigefifagas.pdfIn PDF document text
- https://liho.cz/UserFiles/File/nebeguwi.pdfIn PDF document text
- http://willbramephotography.com/91839011029.pdfIn PDF document text
- https://wojczak.pl/userfiles/file/lizufoki.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_off0000b0eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0EB	10964 bytes
SHA-256: `6705f2da71ac39a097dfe260ff46ad0b0531e05b0fe8e8e9f2411e561d71a3f5`
`font_01_sfnt_off0000ca28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA28	14108 bytes
SHA-256: `faf47bf251405d07e08d9694d971ebaa6c8d8a200cc9c4b7e3e6c2133fabd643`
`font_02_sfnt_off0000ece3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECE3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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