Malicious PDF — malware analysis report

Static analysis result for SHA-256 61af10bda698b761…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 14:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45d2d2264513f6a15e06e7719d877445 SHA-1: 23f5646636c869285344a57b9aaf1e3d3d4bd5ac SHA-256: 61af10bda698b761b1648a9bc0edc03508f767bed4a397b2758fea229a77cc4c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely serving as a distribution point for further malware or phishing content. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ecba3a82b---xuwukeloromipom.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39dc235c1---11610555410.pdfIn PDF document text
    • http://robedecreateur.com/img/files/64864025800.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nogometuxesisorop.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/79200726701.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/jijenemawigoganeropotozef.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/54697958684.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/wonitebip.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xelitojepulepagujux.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/8271937451.pdfIn PDF document text
    • http://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/puxidazafajamud.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/sekokanusinenes.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/livinunokoxoditu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996d6e8fca9---kamexurevesagikijugit.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/36484415801.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/57706384021.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zoduzapolivufixejukigaxi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/42057fdfa23773a0609dee4b3dc0bdd9/japevuxuwotezenapi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7147d421e86e954cff0f3452ec4f2435/56226895348.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0n1kngp053nffja6ce28s2vj6/gofilarutovujovuzafe.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/zotazos.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4599a1015---90144374399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=shure+svx288%2Fpg58+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 20740 bytes
SHA-256: c0706d730dde655b027d0c3b5876a8436aad87b4933389d0c6a43936cb92ac4a
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 10996 bytes
SHA-256: 79304c5987fa5ab0ff1f96d4d0457bc8f882ed511f9b632cbdb2b61349c966d2
font_02_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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