Malicious PDF — malware analysis report

Static analysis result for SHA-256 b833569150da718d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 00:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac7455770b312a554b70488927dccd33 SHA-1: 1b7902863b1befbe896039ed510bfda59abce77b SHA-256: b833569150da718d57ccb50f2866a686b69d8aacec19b5afe00902ac74e418cc
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 WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160969a72ad9af---83401207947.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7vh2g87lu8son9hvvsqpbk9ob1/tefalamuz.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482108cffa---dewupokolinedipise.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/25430013681.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897e6d16a40---66372023478.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/suwowuwatexowasosaso.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zobepupagituzun.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6285987e52---94089092784.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd7a9354e---83593123985.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/budapenejoseke.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63125925096.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/99088971335.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9a369d43---sajamilelu.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/pibutozukenu.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/puguzelededogujedap.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tuzifi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/dodewabakuwusel.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/58793719253.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/xipisudazamatep.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/54c6f55fd8b6989b5e31ccb0c6f205c6/35157839908.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/81070537704.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/446e5f3801e4893b7c8a83135d0a4b86/4075389254.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853f5fa81d6---vufabulujipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=catcher+in+the+rye+summary+chapter+13PDF 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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 17688 bytes
SHA-256: c670e2521b1a71f55b8963fd82fbf8c43b92777a4aac78fe74bc7b02cb74bcca
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 10944 bytes
SHA-256: 10a8e90ee1b3ee97e0650f1c30d15ea51edddc932119890f4ca97b3dde965bfc

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