Malicious PDF — malware analysis report

Static analysis result for SHA-256 25022a0cd918910a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d3eeb751c3b95aa622efaeda3d0491f SHA-1: 710961ffc4839ae5fb8a93f5872b3da3892a2ec3 SHA-256: 25022a0cd918910a76c5322681b81d07294b940ad6280efce28218e1388eb984
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to PDF files hosted on compromised websites and disposable domains suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://krikrik.ru/uploads/ckfinder/files/xetamifatudofasap.pdf In PDF document text
    • http://smartcevent.com/clients/871459/File/10851213332.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/50640928487.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/29516766454.pdfIn PDF document text
    • https://paperland.bg/uploads/file/kuxomakuboromumaxugiru.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad7f28fc13d713f487233087d805ea9c/13495787877.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/093977c7595c7365ae78000912b767e8/jixojumawifurekufurivug.pdfIn PDF document text
    • http://pvvc.cz/files/gufologufufobuboxa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3438c18bc---senedosukoradama.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1200345bf16c72031e8b9fba96bd9962/77762099688.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/vudepowabanure.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/guxijebujufajuwa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pi7evf670kgamqfvm738fb7t0v/66610236642.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/75d596293e1d3c107be991e7c31be1ed/63687808084.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/6076294604.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/genojakinafavogizisoj.pdfIn PDF document text
    • https://badoza.net/userfiles/file/kinuvibelarovaj.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/88745285568.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/31740771400.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160935cdac1b45---88970735294.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/jukogevagujebog.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/9bb5671b6e98d79c2d39dbccf3328f67/89625409564.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/bevukijujikifegekawojubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cbse+all+in+one+social+science+class+10+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 19140 bytes
SHA-256: 268edf4f09d506ee2e7aac41b31a500d41abace5c2cf32a1aa12a75dfaa04468
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 10848 bytes
SHA-256: f8cb6c722a2f7eb5f828854d4569af12335b2b5ff688003f943045acf47a5942

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