Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0131681ebf5968…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 20:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95c4cc29d7f903432b5a6ef32c06086e SHA-1: a8545dd6d9dcca91c1c3a8fd29c8deedd0e97736 SHA-256: 0c0131681ebf5968f050fa924abed669ea5d3cf80c31a0c16694e829db570367
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, indicates a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atlastoursntravels.com/userfiles/file/danavekizetezatakibesu.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/53a7714c4b4d6f5788091cf4995dd306/26571591391.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/75055750995.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/fakidolimuvexusakis.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/11835041872.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/54340230e2e246323e9dddfa04263b9f/23264714027.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4784eb16f7ccce43bef64ed3451e5d19/39190943559.pdfIn PDF document text
    • http://master-br.ru/img/file/71054865535.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e863c891---sedijeselinujagaso.pdfIn PDF document text
    • http://zubrcup.by/files/files/35441184193.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/12dcb11466880baa2fef081e3808c992/rinetubodejomasusiga.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6d1e1640---tofiv.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qboc83b8q8fs0pr3b3bfb1k5vk/95996345039.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/jaxidiwoni.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/vuduxadafejenusejemim.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/duwizixumomuz.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zegogapujixotoxoto.pdfIn PDF document text
    • http://888chji.com/userfiles/files/9705234269.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7db20668bfef147cb42d8d7782a4a93c/88495763019.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/97087274369.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/18438744251.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/34086657613.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1628771809790746787.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zukipemafeduximutavipebaz.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210901_5589CCACB2A93976.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=brother+intellifax+4100e+user+manualPDF 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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 18284 bytes
SHA-256: 7a868089b55fff705c477740fb62671c8cd65d915eeb9902f412d1364fd34767
font_01_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 10988 bytes
SHA-256: 3637faa65ee38fb6484cfc700eec87ec2e9e1d08137db1f713be8f14a8cb7370
font_02_sfnt_off00013d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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