Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad1f130f436b9b0…

MALICIOUS

PDF

87.4 KB Created: 2021-07-30 00:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5862193049fcd713bc3cfb00089a3fd8 SHA-1: 749bdd6c48d695775f8315c21370ecf24e0799c0 SHA-256: 5ad1f130f436b9b04251a557b24760a981528b5e9d392278ef23b6fb6385e819
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript, likely intended to download and execute a second-stage payload from one of the numerous external URLs. The document body's obfuscated nature and the presence of invoice-related language further support its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f12e414de948305a461068710bb12987/rugununikiz.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o7qe0ea1dko3v4tbblcjr12er6/55414941011.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0403481ef8---8299904200.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/27133418218.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9896d79e---wesobefagoda.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/93758442952.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/65684666055.pdfIn PDF document text
    • http://africareview.in/userfiles/file/50639864642.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/49558377563.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xebexigududumuta.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/575822155851620907328.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b815d496d---36550770871.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/73841474570.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8dc69bcc5fef761ac59c3b0de7bfdcd1/gogukefubupel.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/fupobizusab.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/46982231367.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab983bbe8d4---49482764000.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xenogekudixowolefolikalur.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/52796519791.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/fiteguseg.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5a5591b90010dc2838c9b490388de37/jesujigarumuk.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/96214070211.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/42405090213.pdfIn PDF document text
    • https://amgaa.org/temp//files/lisobak.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1a781037f044d1270cf67e8cec498a3b/33386165197.pdfIn PDF document text
    • http://agavietnam.com/img/files/nodabebamiruxisedafikipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cash+voucher+format+in+word+free+downloadPDF 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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 11024 bytes
SHA-256: a1f3be12228bf6f048847514715d7bd60e0971e426274d8c87134cec848ab705
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 17328 bytes
SHA-256: 4095e91279a2453be687c78495df24ec4bdd32483859eca9ed61e38863ae7c0b
font_02_sfnt_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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