Malicious PDF — malware analysis report

Static analysis result for SHA-256 10027dd3df36fff2…

MALICIOUS

PDF

103.8 KB Created: 2021-08-21 06:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 330da22858222b0e5bcbdd071df1e273 SHA-1: 7a20cea9324f55c124d2dd31d911c3fd5d378305 SHA-256: 10027dd3df36fff2cd1da4ca4a135e3934a4c73fb6d41ea298fee1a3b48f028c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=behringer+u+phoria+um2+driver+windows+7+free+download PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826296dd734---fawanafuvemeworesazagebik.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rafm621ssae8tua7ku7olpt631/majuwajirusus.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/53cca19eb543c6fed3565aeab32f8eec/koxufofuna.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c2814034b---mekanimamatini.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b53da1d8d24eac2f533ceaa82656aa3b/16022015244.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607560e3346f6---55470191653.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/pijakigidubigux.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd340c5868---newojojimaruzojo.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/56410571195.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/44190033140.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/gisewetuvepeledobaforela.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wovogusipetutebaw.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/zodezopu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce71e48003---zunopisujafik.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9626e96e178382b4760bad7ad584a62b/45083627888.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9c7f204850c03cc6f72c694535199c/moviviratul.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/398aa2f096fe8911ebf7c7f1770a73ed/notimuxijujobodanurupo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/29035683867.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/kinodufapibibun.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/54226365327.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160926dda6e974---fowikujiw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bagiravexidus.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef2c0dea5f3fc2344dc2d4d6d8e18d58/lasad.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 8076 bytes
SHA-256: 1234bf051a2db503cbc150f3c2bae92c6ace6d7b75b0ccdea4f5e65a8a8bdc23
font_02_sfnt_off00014480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14480 17820 bytes
SHA-256: cbf820014cf6a632e50a4f2c377c97ee9946e985510ea05054b57643af79489c
font_03_sfnt_off00017375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17375 11324 bytes
SHA-256: 938dc64843de42ebf024374bd1606d38c2aea13c77e9175e185bb0719c103867

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