Malicious PDF — malware analysis report

Static analysis result for SHA-256 82936b859add7143…

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 20:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d0b41ffeba009f426308a1ddcd8ddcd SHA-1: 47b7bde26f7b3871d7631410641ca88b7321f580 SHA-256: 82936b859add7143600cf8f408c1d611220e82650d5c333b8a6310f3faa328a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cabd9552---fumusewifozovenujadaf.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fatfailogistics.com/fckeditor/files/file/fiditomaloduzilu.pdf In PDF document text
    • http://hasdeu.md/data/userfiles/files/dinopotujosudoges.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399628c38f6---39937153020.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147ace4e9e7f---75887391939.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210916154558.pdfIn PDF document text
    • http://www.andreapondika.cz/file/76403898799.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/28439106068.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/misabob.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/22260657694.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/tibeveleraz.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/likubefutivu.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/37826059938.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/foxiguwizovire.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/3970629675.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/86152735109.pdfIn PDF document text
    • http://klemanpince.hu/files/file/67786817228.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/ridifanofarafituvigobadu.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/bivaruluvesixeg.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cabd9552---fumusewifozovenujadaf.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f862060a71---52079500.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/dexuwen.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16135047e15531---20452404850.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/197d1ab39c57fe9b25191aeddb9f7648/79705421670.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082396e251---86648578156.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/kumikalujona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reboot+my+motorola+phonePDF 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_off0000c588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC588 10588 bytes
SHA-256: 2ecf21eda225343e874f34d50789e048df75f8b8b27fec56731a5a4bdce3c127
font_01_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17212 bytes
SHA-256: 7be22cc9a6cfdd53a10a922b2456dccdeb81d3412faa5669b6ea8e0878d90965