Malicious PDF — malware analysis report

Static analysis result for SHA-256 512710c96086bae6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 03:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf3fcfee101407e90baf0028096d6b65 SHA-1: dae6b489993910ea133d5bc9c65d8d72a30cfda9 SHA-256: 512710c96086bae6add29180044c1c0334e6b2100f99e372f94ec0d1fb22d339
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Numerous embedded URIs point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=real+drift+car+racing+mod+apk PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0dede65b9d324de7fcc186958cf6ea70/10211704605.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/nusotuxabiwik.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/43012186004.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/4596075730.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/50972304585.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c5218387ef68907e55050313f5102145/dakokalonerirarugiga.pdfIn PDF document text
    • https://eurotig.ro/file/gawepenukomoxazalegan.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/sasofir.pdfPDF link annotation
    • http://firewheels.pe/userfiles/file/92606538908.pdfIn PDF document text
    • http://citra.cl/userfiles/file/bofidefedipezotanavigotev.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/32110997329.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac9e2d198---detujuwedixonomu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/kexoritumezene.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/66415811767.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/87731533052.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/70952361844.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/66593667339.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/liperaxurobutezinakunuzo.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/5623441373.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/32391650124.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/76725129838.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/wolonerozirelubonil.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/jekabasupatoselexuxoroja.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/37904364521.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/pejole.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pegukovopamunesor.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.

FilenameKindSourceSize
font_00_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 17612 bytes
SHA-256: 503e11866b3bf66802fb4c0157f67d57099be6c00c2d0237f75247d867c5a538
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10932 bytes
SHA-256: d4db29557f2142c73f261ed55f61d860a4ed8898f40d154640057e4b3ea7ab87