Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32f20024c89f3b6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 14:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3eaa8f61d67ec9de7a6e821b48f315e0 SHA-1: f60c298754e9a1a9c48c40a098af39210bc1bb7c SHA-256: f32f20024c89f3b6d6d1b383b1d9ca8d767f561e061f6eb8e7af87e7c36a26a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mgs-on-track.com/uploads/misc/files/31344715596.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613accc9c1d7f---xitalatazovonu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090712174273499.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/36137132342.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/98882176632.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/kitarof.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sukejopezutipavex.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kenawedonorulew.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/65056061392.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/nawolonubipazunoxopon.pdfIn PDF document text
    • http://remobudostol.pl/pliki/nulifekafavevurefinoj.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/32346435327.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/633f6ae1a82f2d2231860244dfbeeced/82628558662.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/duwatelutus.pdfIn PDF document text
    • https://vzglavniki.net/data/file/40911518297.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090706495751.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907092404876875.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/77024299102.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/87288548015.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/wisoserimiwalenemikaxoxaj.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/kegelawufuzosixamor.pdfIn PDF document text
    • http://offerparts.com/upload/files/zaluzekoti.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/aajamj8cehv61hmqvjvkq9psk2/katonatuvomixezefazate.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/97013339511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wipe+out+data+android+phonePDF 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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 10368 bytes
SHA-256: 2ad0dd3cb0e4d023bf30f571f8fa73d4c12d2b42bde93903fd82d609ffd79d8f
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 17620 bytes
SHA-256: 94586043a3983a79f6c68efbda570d882901eff48fa6c84cb55bda5d47c42d0f