Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d89fc771728951…

MALICIOUS

PDF

71.7 KB Created: 2021-09-05 14:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e1aeb38edfc1021ca9ea02f656ca4bc SHA-1: 036c64f19517509b46ac723a4732e2c79b7e15db SHA-256: a6d89fc771728951281844d85ee3a01e56c493fe758c03f11db5aa2b3183c950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary function appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c20700aee0770e5c976905d9f09f5013/99330484694.pdf In PDF document text
    • https://somogyplusz.hu/files/53398215328.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/11121835133.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/bonunubatow.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/83081190537.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1bc63c01d3e428a0732854bd65018110/ridosalosibupip.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a169de4249982f86d2782c30e793eae2/bosusanefodivodomogelilut.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579741b936---72802840282.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/9327597212.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248a2c73ad---vilomawanezibipujesivipaw.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/7072250094.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ff312768---27195701752.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/70508101264.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/54493947276.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/87741449604.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/lezidokopakufapenow.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/12473400300.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfc1e03af---laxovi.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/kemajunifukalepatekesatob.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d926ff06---16888873226.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa950a95931---tomegijukoge.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/zolom.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c34135bbc---nademejexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sda+hymnal+pdf+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_off0000b5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D9 10680 bytes
SHA-256: 78caef7dafea38bb4abd919dc987c5233555f8ecc842fec908fab368dea91345
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 16884 bytes
SHA-256: 9fc17531dd6ab3edbd9df436cb0d5f4a10b2a146e3d39283f0dcb4aa592601c6

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