Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad4312d06981fae…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 21:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2bc1678882223e9286062fce619aa1a SHA-1: 7c656955917abed4573bb63ea576d5fa26aa2bb6 SHA-256: 9ad4312d06981fae8453835e3aa7c15a583d022eb68c362c31dd665ae287f969
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=android+play+a+game PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/be9ebbddf8b24d370a5388ddbe0a6579/pasatif.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/wabunimitimok.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/23033805251.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/89042261548.pdfIn PDF document text
    • https://buyafranchise.org/files/files/bisirituzuxikok.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/33960765211.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/13680210249.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136017c72494---45643437434.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/degimawuvafaferavu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/jabazo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b2dcc66ab8bf065e25c77c0e7dbcd678/55543542281.pdfIn PDF document text
    • https://lordoptika.hu/files/files/loritevorofafuwo.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/17247360407.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/31805995875.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/85796644768.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/26476481075.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/42019894176.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/jiwilifikit.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/tevilojiwugeze.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a7fcbb4c---wovikiguxejaviselanawof.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/41989021053.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/93435400306.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/4734324402.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191949426174.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/dolunufaze.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_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10564 bytes
SHA-256: 1b8f8e2364c3091d37ab98936193a683cc9a7fc0fe36b1cd3f3acef62e855c66
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 17876 bytes
SHA-256: 004e4002e7dc2b046b5bb364086d5ce1532af616d969664da53e55cd839d138f

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