Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa46da1256b7535…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 03:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63874195f8a0392ed8b5fc057bbccc9e SHA-1: 13117e9b041b3d0eefc6287de46a0b1e03594bf9 SHA-256: 1aa46da1256b753503ebbb2113c6cbe7e1d6c90a4a5f532ce2b9fad25f8fbfe2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613057d9d46fc---xojegimomomunaxozosokifi.pdf In PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/minug.pdfIn PDF document text
    • https://motecx.com/images/file/neneluxuvud.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/12602174140.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/megilab.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/witavovitu.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lakodazuziwagozagidef.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zutobulawovogopigus.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/81253992649.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f933741e9e---18619575537.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wanurolukowof.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429d8ad725d---newepodab.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jewuduxesorotarefusonimok.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/ledemuzetaboti.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/16991074814.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/pekagefikeborenuxaguw.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/59256139396.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/35210093837.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/56001252165.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141135796904---61421538752.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/53685390468.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/82966434950.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/99569619611.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/xuzaropuzatuzedaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=transfer+contacts+from+android+phone+to+ipadPDF 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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10800 bytes
SHA-256: 193e3dc85ceeac922e4a3336f87047ccfc87ba3e788ce4745c9525c7378a185f
font_01_sfnt_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 18724 bytes
SHA-256: a50facdaf8b005aa67a7ddb0cb6757e2128048905c50bd14b7b089f117f1d00a
font_02_sfnt_off00012cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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