Malicious PDF — malware analysis report

Static analysis result for SHA-256 72850ee2c047951c…

MALICIOUS

PDF

98.9 KB Created: 2021-08-25 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f342a9c3a5fe53ed92f77d0f4c7fd86 SHA-1: d6bf98be04cf15910a9913268cf6f7e42d93c8c3 SHA-256: 72850ee2c047951c0bc5278964a8e3d3de3349aafcff86faf32ad15c19711dd8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9759

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://alvit-bk.ru/userfiles/file/20515828745.pdf In PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/34455767807.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dulebowoxawi.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/52179791672.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210624_6AC70B68E78F92DC.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7252cda023---11933357374.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xevad.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/6581302927.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/dubelizebunetepik.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/vusuzuraragivetomikane.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160799048dea31---nojexokudotomune.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/teruzusejonowizufeto.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/62149905346.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/56049950156.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/46650395742.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9gj1aatsuhbe5n9l20pdkiejl7/komefivigirufexivawer.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074dba1b526f---vujekofipuji.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/66692711946.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210725_6055D10D6AA2683A.pdfIn PDF document text
    • https://edarky.net/data/file/1563047633.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/53295535391.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e5e9007c5---kirovevejufuzu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/rewegovaju.pdfIn PDF document text
    • https://limsurdua.com/contents//files/79096037320.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/sekolevavaduferuba.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/dogotulivavaga.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/h3ke76af21vb8cc5v406do00m4/18273638742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2pac+keep+your+head+up+free+mp3+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 11116 bytes
SHA-256: b2d6006c30036fcc4bbcc79fe932a3b2b1ea46db2341383cd94a3232d0b1792b
font_02_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 18692 bytes
SHA-256: f60f768d3020d6c1a8a9f08a48ab2bda58761e64c163837438a0804760f7b986
font_03_sfnt_off00014cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDC 16364 bytes
SHA-256: ca2602d65a375fbe02fa3e7c81e1256e47710d68609654fc75c88204174a9643
font_04_sfnt_off0001633a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633A 7256 bytes
SHA-256: cf55eceb22dcb854d9bf5373ca819a079164abc43dac70544cb4f433e6254ace

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