Malicious PDF — malware analysis report

Static analysis result for SHA-256 4876ad8451e6be2b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-11 16:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3d7f2a95de0744c5a2447dbbf5696a10 SHA-1: e2b02c2f106baf76568f0147bb4dedfdba966703 SHA-256: 4876ad8451e6be2b561f69e2f18178ce833ca4e5ca6edda52b4c3787e485fa5d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://abcoegypt.com/userfiles/files/1425308995.pdf In PDF document text
    • https://livnica-metalurg.com/images/pages/file/riwisofen.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/jixemuxuwuxulodobugijopo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/70603488202.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/xiwapofot.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/repodewenex.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wufukilefonigek.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/norid.pdfIn PDF document text
    • https://tipresentoio.it/images/file/1821682335.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/duxozu.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/suvedemumu.pdfIn PDF document text
    • http://davobio.com/upload/files/65918181746.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/15680253754.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/24274213467.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/marowuzafukadigevajaruta.pdfIn PDF document text
    • http://taociren.com/upload/file/210908091936228252mcagvawljggt.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613499dd67791---39095199009.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/42083249888.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/vepikake.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t14ek4qutksd42ql1k6kja7683/tesanokipa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613729a755164---niveso.pdfIn PDF document text
    • http://vina2002.com/uploads/files/1867813959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=engineering+scientific+software+examplesPDF 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_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10992 bytes
SHA-256: 0e91c4bb5517be1eb0c5eefbdb31de20f57984161ffe94d469355313984e66d0
font_01_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 18004 bytes
SHA-256: ef19485d6d61683d5ace9cb3b7aa8a668aa741c56051f37189336e50a3a4ff82
font_02_sfnt_off0001407c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1