Malicious PDF — malware analysis report

Static analysis result for SHA-256 add157f01ea26f5b…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 10:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 667b699775ffee4205d9b888586f14b9 SHA-1: 250ace0eecee4f7ce7772b9c6f185cf8c2316e8b SHA-256: add157f01ea26f5b4aa30eb9572806e1e7239158cffdeeb3fca590cbbd3c31fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=shear+strength+of+metals PDF link annotation
    • http://currycornersugarland.com/admin/images/file/vadomokowijoniropufa.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fa6f53qsmad3h4f6kiuavk4t56/vonebakudubikanabapixa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d36e85fca---35458850375.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c383813685b16fcc5c7421a8d275a2db/59530230917.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/zeponifupu.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/kizujufiwunozi.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/55634902003.pdfIn PDF document text
    • https://bloomeng.com/uploads/gosaw.pdfIn PDF document text
    • http://www.celso.org/download/jabetopasanezunosene.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/38686476302.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071d60e83ed8---pemifu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/tugunugurekumezane.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a26ea4cb1e82a5ea1aa6492417206f36/32662284831.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9eaa76ec704a07c48be4f24dc8302153/folojowafofovesifetafet.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6de7778915---13501754249.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/53294149905.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a888be27c29---41807627136.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/126b41f6e62e56238fd9af6a2e24dc6c/34700380749.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/52906215256.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/28259945555.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/daziravimelava.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607937b279fa9---29863729632.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/58583378711.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_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 18792 bytes
SHA-256: 09e2e489a1fade9d12289268a4817db1ce8582934cc0585eefac2a48933c49b4
font_01_sfnt_off00013850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15067 10644 bytes
SHA-256: 157a30767dff2bfb253dedad1743dc75efcb4ca16e5e9e29253a54a83e7fe647

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