Malicious PDF — malware analysis report

Static analysis result for SHA-256 facaf0426c1652fd…

MALICIOUS

PDF

84.7 KB Created: 2021-07-27 12:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38bdf4083e7c6fd0205554fb1544b9ea SHA-1: 0357456f5dc5aef068914d7c08b2b4018b16879f SHA-256: facaf0426c1652fda2259ebb1a88db37c87d6f310c5549238d8822c7e7b27da8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab39c45ed5---rojuxomibimufarivamafam.pdf In PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/85613326444.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9bdeea6565c445fff041447b8a17b12a/67753664264.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dc969dcf1a6---8047755622.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d9a876914f7809548ff82b542f3b065c/24523183477.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210607051546.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nikemilixazik.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/j4q559eita41euoel7lumgb357/rakuliwikudumive.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d33986f93---kizex.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t5tu6d9jpg6g0ermdh5ldeh4cn/80613860747.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/50386715987.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4m8dq698861s10fg4klmjf1d95/joxuzukekivaduxofa.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/subuzaw.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/79228822862.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tjrl41b27aagpqogesng12e9v1/45094388203.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e96474de---nasisugadatakigida.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d8c007145f6fd344986695a7cc71c330/71111858430.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda072183---rewinomekenozodazeva.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23762d4b5c---53203119009.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/77613600565.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/japapiwebup.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ce4885d0c4ca006cd68f4c18053af29f/70751524372.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16229281831766121655.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/69952173899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+hard+is+the+ohio+motorcycle+permit+test+in+nyPDF 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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 18896 bytes
SHA-256: 5b0fd758837e32d46a74fb18c5ab1ad69d1b880e32cf0a664173d2fbe8eaf38f
font_01_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 10968 bytes
SHA-256: 9ffe77ebcc40858688a439f645598838d4368105582b73759d18f02c74d2c419
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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