Malicious PDF — malware analysis report

Static analysis result for SHA-256 099bebd14e0cd097…

MALICIOUS

PDF

89.9 KB Created: 2021-08-31 09:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f392c19f7f047f5727581ba0f0a3b7e9 SHA-1: 99e43f8b34ed41e386b311f31c5f6ad30802342a SHA-256: 099bebd14e0cd09762028f1d5bda3b38f067dd92a7e06050825ac9d3843e4adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tandartsindex.nl/images/uploads/34532561188.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610099e323c26---vikafikolakinimek.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9gui7aa7vnr89mftp0cj9o4rf0/86332324996.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/waravisin.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/68f57b3810e67d051ed139042bfad718/78176879808.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9b0b6f17---79147306322.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/27042760903.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b37f00e2---49904286097.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/9564877881.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6c404636c280f86209c55b18b89b146d/kobabavifajamo.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/mekibewafa.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/46d39f872556e113398715e26423a68c/68851353635.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/lidivadavodizizumesu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dc3c473dff965bf666379f6ce7bee714/koxuzagetawok.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/45300601487.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3kuc1o1ia860i7khunldq1b6sd/5802680690.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7200e75aab4e88007d223d3efb38c368/navipejuwurojaf.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8a8ceb9a---46113277436.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/p32sd5arifgbfv45fa62gb8gfm/23104457736.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/935f4b48ceb11ba4bf2154b30e48e5fe/nufasisobefupexam.pdfIn PDF document text
    • http://coffee33.ru/archive/file/10670719725.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/90227899395.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/50c2492a57018c3872fe5058565b7717/5214779281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=happiness+charge+precurePDF 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10480 bytes
SHA-256: 3b7ac71296c839234d02f3f52c1230fc26ca8fe40c00dabb22485f2288cac5a0
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 23528 bytes
SHA-256: 7b2908ae207e7b38ac0c0b32accf0f1da06894ea14f8949c3e5d89f35fab4909
font_02_sfnt_off00014109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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