Malicious PDF — malware analysis report

Static analysis result for SHA-256 6705f5c9e9bd1077…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 03:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b3a0bd058c6df5f20a58947faa7ae13 SHA-1: eb2ab0162324aac4cfe3f539c07ca0bb56f00aec SHA-256: 6705f5c9e9bd10774a4440f3fd1e29718666816898e555e83403f26e3bbe2c79
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://aaaexpressac.com/userfiles/file/17461292440.pdf In PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608545242b018---94511724013.pdfIn PDF document text
    • http://stasta.com/userfiles/file/dajine.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/67012166097.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/93800173831.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c335d66eb48---51145494706.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/nufukof.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/pamumutilajunis.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4ab6920bf---82471338342.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/vejuwemolazutizotan.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f62b8936---gaxafutugiluzepelosam.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nepuzigejuketapidode.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/mojiruna.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061a7f25094---gamopusumuwupilizoru.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789829ac6db---39422350027.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bupim.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0cc8df09---83849086395.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/35f2d420a230c3f321810acb4c718698/zipufasabegutedo.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/muxas.pdfIn PDF document text
    • http://hongdacable.com/d/files/niludosaranalefoluluderig.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051614434073499.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/915epb042crtdeqlekhsc8ui25/sarerulazekogufuw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vikugipatukejozopol.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/riwewudaxopejederepakumal.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc333c5bf---40594532973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=je+vous+salue+marie+combl%C3%A9e+de+gr%C3%A2ce+pdfPDF 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 20500 bytes
SHA-256: cf133b1448a82b75037cbdbc309a97f21835b6ee8cec54c19c8a4cad67cec692
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 11400 bytes
SHA-256: 374611ce6f4e70859fa8ce7c5a770071f06ce2ffd0e5d1362635d356cb1d4836