Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a00644b1fb46f9…

MALICIOUS

PDF

96.1 KB Created: 2021-06-30 19:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc5c2cbfb09d4db57f46ff8a8191bd57 SHA-1: 0af7fc3ab9baa8cee88f402b7de93e64b22461e6 SHA-256: 82a00644b1fb46f99397a3702d93184bbda181ea015e63be9945a3e0d5086aa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable domains. The presence of these links suggests an attempt to redirect users to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=immunisations+for+babies PDF link annotation
    • http://domeinbeverdonk.be/assets/files/file/rilomamexikafi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//40378213574.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jdadhfcibo687jlpastn1rff0e/34725202659.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/52426772357.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607049447ced0---74862281920.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215211514471765.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r3c61kaeobihk6tu0eli1ekqlb/16841864046.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607444d7efc9e---sepafadosam.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/mulumakalasok.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/89982951870.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/53464465057.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216685625609.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f6239844bcac92e7d267157675f2e6e8/7189706897.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6823989508---86192735966.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c410054a9---29594379345.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d16ae4e3c8db90dd6f382e97187545fe/17495053261.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/93c7aa943debaf516748355d0d1c0d05/nafajutekakasalobobemip.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/61951843407.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5607e57a---guvegon.pdfIn PDF document text
    • https://airshow-bg.com/file/nawimodepozilepo.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/88209819372.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5406a45039429549ef0915aecb71b7eb/90205290409.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/37d54eaf8db5d75aa66eb20c8c98e8dd/xudesapik.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_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 17192 bytes
SHA-256: f8adaadbab3eb233e5e7c8c14fb4b449bf88181890aaeb50234ac59da81ad0f0
font_01_sfnt_off0001432f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B46 10520 bytes
SHA-256: a02273c9c4393b948fdd6fa97261695120cc0d3786370f1a4c599b8278b59fff

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