Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff1aa70d03444e8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c9e2df43379a1115965167ea6d0650d3 SHA-1: 8e6de4cdcb269b08be236fc67814abacf87ffb4e SHA-256: 0ff1aa70d03444e8383a65f58b76f3e4e3d32acfdf7f8baccdca2f214e758034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://arch-teh.com/pic/userfile/fijotukosevidurikide.pdf In PDF document text
    • https://planet-for-events.de/userfiles/file/7583655750.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0668090c13---36147105986.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jexubetowedenipug.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/ropezevebo.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/88265416133.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/fagulamefebef.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/33693117173.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/vivopinalusukegetipo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6b823d42---pojizag.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/jukawigawejoxebazeditupas.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f7d884d44dbd721eb681c0b298fcd632/10971040383.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/bolunibifajimelesomana.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/kiwujejamowuwebukinem.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/88143739626.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c151e5ee094---zadiperupegusiwodusudirom.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/78814514390.pdfIn PDF document text
    • http://immopolignano.lu/images/42319203732.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/31204000698.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/83978956854.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609187fec8448---relojagotomakubaja.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/mibukinavomufudijele.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/89165037088.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef440ac42---delotib.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/keneforumelojiwofegipida.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mogipexanuravexezogiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+do+mini+system+philco+ph1100PDF 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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 11060 bytes
SHA-256: 923aadc966594f274cd458201346eab076f4b8aa930f904c680a7512288bd516
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 19300 bytes
SHA-256: a7a80013382e7533ca4157a6886fc4e5e01836ba101e10c0379fba5bb07c4b2b

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