Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4da918bee5b1b9…

MALICIOUS

PDF

95.2 KB Created: 2021-06-27 19:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10d672798d3a2db2d63033282411909 SHA-1: 2a9e56cd6d6d6133cb893cd3023c6b0de1955886 SHA-256: ff4da918bee5b1b90ed21d367c90dd5526e7d216a2d334bc4beaf76d12196fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

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://icbacademy.com/upload/files/titeropanis.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ed78cbd6---gawumevozimadigajinezor.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbc6f0c0c---dederawi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b734c62d---36659944415.pdf
    • http://wecans.net/_UploadFile/Images/file/vodivajedame.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6478db95cc21d35cf52fd3523a0b86fe/domodigiruvewatigimokesi.pdf
    • http://anbao.vn/uploads/userfiles/file/29433718916.pdf
    • http://birkhoffhi.com/userfiles/files/75489564125.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3be30b61154f56d4f0b7f8fa06f28e62/56821933630.pdf
    • https://topclassgreenery.nl/images/file/zidixufolarunenaf.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xesugirisiroguj.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210614_0992968948B1D849.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7096826e2d---kepubaz.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eac281b90---95384530225.pdf
    • http://nelly-design.ru/upload/files/buwoxigeko.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2bc812cb---62095350872.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e83b71a19---bokiw.pdf
    • http://roycraft.ca/userfiles/file/lepazefojusopumoju.pdf
    • http://studionegro.net/userfiles/files/tosulonefodimazigajaf.pdf
    • http://bpsstudio.hu/uploads/63840860874.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/aoam8i43d61jahsehi7490j2t5/gepawajisizozopen.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3a78379d4d760fa4a71393d740dc231e/263810985.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=veal+cannelloni+with+bechamel+sauce
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011003.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16792 bytes
font_01_sfnt_off00012815.bin
4f4b0e9fac169b40e8276a010ad650f1b84da77604b52cb98b775a43f1870e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 17604 bytes
font_02_sfnt_off00015569.bin
3ee05c20c644ddf07525a2d0900cf2911a1c24489c9031fcf1ffc2e8b5d9feaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x15569 10688 bytes