Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef1dde8f94eefab…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 03:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea8898fbd6abbfbec934245f176b81a4 SHA-1: 0a6b28700b3ee24a0cf28264902a755147fda6ea SHA-256: 0ef1dde8f94eefabf48ba6328d7b363fc37e38a0ead5d43f7fe7c99b5488df5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261f615faa---vanixozul.pdf In PDF document text
    • http://yey.uw52.com/upload/files/725004881.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/66015016044.pdfIn PDF document text
    • https://forumsevens.com/images/file/62443045775.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/diletinon.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136771447e1a---37975852688.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/64432570485.pdfIn PDF document text
    • https://jss-moms.si/upload/File/lakowa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1039cbc34195cd3b1350095a86a00a89/72383400116.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/45390499966.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/vopiziwerufopuwulividiv.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210924061812.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/4245821593.pdfIn PDF document text
    • https://777mto.info/contents/files/22788014897.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/tuginurudimuwudi.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/16032955634.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210902_FA5C748E96D0FAEB.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/lujeporogajef.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/77348321474.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/80721991284.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/lavonevufuwuxexisar.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mozud.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/wevegotidaxivenim.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dp203gcbctj3h241u65n1d45qk/wiserulasanenidare.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/11419501628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+keep+cooked+chicken+in+fridgePDF 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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 10692 bytes
SHA-256: bab0ae149e579fdfe022a560ef3e5ea2a3be90594990cfde3e871a158eec9012
font_02_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 16696 bytes
SHA-256: 3e443bed4a6df8ec3d90cbc7370149c58a5dba5b3314eff4eead65b1971eb8f7

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