Malicious PDF — malware analysis report

Static analysis result for SHA-256 255a4c0fee34588b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49398387865a8de05ee5c91a4642b0de SHA-1: b792a45c1a22f8f334a169babeeeaa37688244a2 SHA-256: 255a4c0fee34588b10d2e15085896980aca32c2eec0774d949e2bb9e85fef7df
204 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of multiple links to potentially compromised websites and a specific heuristic flagging it as a password-protected archive lure. The ML classifier and ClamAV detection strongly support its malicious nature. The document's structure suggests it is designed to trick users into downloading a payload, likely disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sunarchegypt.com/userfiles/file/zutama.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cab64d37759c61dfa6ddafa1a3e32a75/suxoxipusej.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/juvopon.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/begifagipeso.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/69837868210.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/pupedilejalabopelemefo.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210828020333.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vugok.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210814_B9BA548BE4149625.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/72313218006.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4b7c051d---semudokewibilatopo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/647c40065f62d856b739e45270bb8128/54275457328.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/dodexadore.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/e4nh7uqruk4fbqm97gra8tqr8g/xonojoketepowurigigeg.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/31220145821.pdfIn PDF document text
    • http://gardatrans.com/content/Files/87256238247.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609069c746c00---79340574191.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/89534786238.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210626095341.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee486ef65---74351776323.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/45485814108.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad39969041e---rafoletivuvuxujir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+pdf+full+setupPDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 10252 bytes
SHA-256: 90a68b5723391e0da68a5b1e33d07880f2d5734528c318e680c014cab2665fa4
font_02_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 17520 bytes
SHA-256: a3ca74f3736deafe8e9526a6fc9a10ef8fd39d0e178cfe5f3c3a3277e62832ed

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