Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13bd4c022e406ab…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 23:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ad36950f4adebde468288e08ec6537f0 SHA-1: 0a079bd3165f134e9c15f567eb70ee0a33dcdd8b SHA-256: a13bd4c022e406ab78aa7f0ff8f932e81d0ade55e318a87e769004ba5cfda775
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The file also exhibits characteristics of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c73979105---rumobopuxufi.pdf In PDF document text
    • http://xinghui.co/upload/ckimg/files/202109080910364867.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/61913261262.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6be2e220a---bujovusizogivonivu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629291cf6---tazolixitefi.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/13907102636.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/96351676172.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/30974195761.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/18780900364.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ddf75383---jebuforowifomijunuduzi.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/vefiradokopul.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/walukulipuleg.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/melomav.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/kulakulatisabijefaroxegi.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210914171131.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/viviwibasepugobisiwavi.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14201854163.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88672491436.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/66980538573.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/xapowimegorapak.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea64d1de10---xinelominatekigefevumaxim.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/30204516552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=trento+agusan+del+sur+zip+codePDF 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 18872 bytes
SHA-256: 7c35761835e9626bb43fd55f785fefeae0d5fc983bd15252e4820ded9d6298ae
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10812 bytes
SHA-256: a86164a6dcadb6662c94dbface0bed1694813b07bbefed8f79cfbe3794c3e85d
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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