Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78368a7e3afe74d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5067106272c163cf5037da12e136d75a SHA-1: fadee90a1e0f7d4a1f0a0cde093e9f0a84b54498 SHA-256: a78368a7e3afe74d847b0744bfae8934528d237df2733345ce42888b1b25a6d6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users into paying fees for a non-existent prize or parcel. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://alrabbancapital.com/file/files/fivugevopikowaxebuboja.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0a98d14af6bae65b55980897524efd39/tupotefibopukowezasimala.pdf
    • http://elma-itc.ru/!upload/files/1887163920.pdf
    • https://banghenails.com/upload/file/79219046266.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/rubiwagelulodurujobif.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/zuson.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/26223532504.pdf
    • http://kantoromega.pl/userfiles/file/wobolivunu.pdf
    • http://k-ookuma.com/js/upload/files/83166888126.pdf
    • http://derp74.fooden.com/UserFiles/files/tafig.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3f3ed1697---59274447077.pdf
    • http://infoguard.ru/content/file/66084175661.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614881eaa8b3e---35820818298.pdf
    • https://pecintajp.com/contents/files/57550672406.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/bugedetifebukesenote.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161438d9cd2165---67046155482.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/lulijefabe.pdf
    • http://asesorgubernamental.com/images/file/81353159467.pdf
    • https://onlinendttraining.com/files/visono.pdf
    • http://www.mostenpo.jp/userfiles/files/josezovumiled.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/vapatopoguri.pdf
    • http://leguido.net/files/pitidejeka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bayombong+nueva+vizcaya+zip+code
    • 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_off0000cb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
font_01_sfnt_off0000e31b.bin
9c6f74ca53a9cebad280a4d87602e3a28d3b5888200fcc147652d7b7b54d8149
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 18716 bytes
font_02_sfnt_off0001145e.bin
8af8b67532d04f92f520411bbce480e64fefcfa696d058a08e21fa4e20cf7e8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10980 bytes