Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaafb8324b9549e…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 11:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b037ad51bf7dc63936d60456fafb304 SHA-1: 6bcb45e3a244ea3a91ef8b5e20a9024106fe7a9d SHA-256: cfaafb8324b9549e9b3aa9b804ab916d4571ad790e720eaab066c1d2f43972e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://noursportevents.com/wheelmarine/userfiles/file/dipijotagusofejigizu.pdf In PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/11319033649.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/fozeka.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tavesopakomudenereredumef.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c175182b6---wavadepugijamexixakiro.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/geniwutotaboribozibog.pdfIn PDF document text
    • http://maihome.hu/admin1/file/38896847382.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/pufifomowujavutuzawidujax.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45418480959.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/volun.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/volubimed.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_8D4E2408F294AD73.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/rigepimupajuwudiwoti.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/41508431158.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161362fb7aaba0---90448268446.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907184853655.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/farominubas.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bigokudajakoxuwonij.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9eee2a9f4---zejezojo.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/ruvenuburadedo.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/pojudebaj.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/84838286564.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/gikaxigobeze.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130bdb541dfc---kabuvatagegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=apps+auf+sd+karte+verschieben+android+6PDF 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 11216 bytes
SHA-256: 9ca3d1f99ba6de8f573cd58a997f047b585aeece9488dbd7eb32c8a32935a5c6
font_01_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 20108 bytes
SHA-256: b8552005bd091e0f238d83575b3b254f0a69aa50def5111d17c832ee56b8484d
font_02_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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