Malicious PDF — malware analysis report

Static analysis result for SHA-256 630db6b10d4d66c0…

MALICIOUS

PDF

79.1 KB Created: 2021-10-16 20:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 115ce8be97a5149cf7426b8883efecb1 SHA-1: e4313b8a20e6f2d32d51455e71f98558e9d3fd01 SHA-256: 630db6b10d4d66c0c06867cb04e40119cd3ec33865fae2d27d6e218a816a4115
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ngocvietbungalow.com/upload/files/tapokikoxa.pdf In PDF document text
    • http://yossy.biz/userfiles/file/87891442993.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddfa4e3b40---gewude.pdfIn PDF document text
    • https://haidangpc.com/contents/files/584389822.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/18897065090.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/36356665601.pdfIn PDF document text
    • https://invest.pl/userfiles/file/mibagizajujifutafa.pdfIn PDF document text
    • https://doitoutdoorz.com/file/pdIZaoE6pbKpp6I7.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/70996781755.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/fevasi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/637f2eca9b70110d0c45d31df5b16583/6373080601.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ef23552d---48166265131.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/wizowavolalosaniri.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5bccc32e151ca0dbdd2d781adb1ce9b4/58547312484.pdfIn PDF document text
    • https://manejatuvida.com/images/file/40411095371.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/bofizixado.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/legubinivefukizunagazuvo.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/wusagaro.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/56417357111.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jobisixaxok.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613879af61703---49570347154.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cc9d9b7830ff04fc3c807a3acef78197/batovawuwibume.pdfIn PDF document text
    • http://cocoal.com/uploads/file/57362052404.pdfIn PDF document text
    • http://xprchemical.com/upload/files/kexozexeg.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=space+allocation+meaningPDF 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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 10524 bytes
SHA-256: 890a92592c2fc2cd68df5ebfb8d2aba731cc41c2eb4685fd6ca6853cefdc6bf3
font_01_sfnt_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 17536 bytes
SHA-256: 1db653e30dad71f1a7c5a6e4ce38075c497a396d79f8f543344dc13547edf6c9
font_02_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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