Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4877cca7e5b7dd4…

MALICIOUS

PDF

100.5 KB Created: 2021-09-22 21:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b37e5dd2b3932d5147f8f91f0c2ae392 SHA-1: bd8fe51f226ab63e7a40831bae78181027dcf2b3 SHA-256: b4877cca7e5b7dd4cfab369dc1667da5a8351742e27e7a153b5c8a7177a7be7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3362de3ffd3c7f8b62192a78b74fc0c4/xofezasasumodenabiwemi.pdf In PDF document text
    • http://vnndt.com/Images_upload/files/sidajosadifebuletude.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/38212ad918d20a6acbb07538694a508f/19479172445.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/putotoxazegevere.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/banijizu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/viwogereju.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/puxutufiterunopuvonafej.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/nazox.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/26667092145.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/660303030612ffcdd2dc9c.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/fufawimu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/58604257522.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/bafagoxinejuvunanas.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p6obnj22ossu28p7o3qjooul3p/pederur.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/zodovapelofujagaxel.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/74635562912.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/wiwebabosijum.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/goledogejawimojiwukesovel.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/putapumuvo.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/sigidovuwew.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/rigidiromizaw.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4becb388---72537824429.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d563d7ad10bcb6b205dadaf8e7d0165b/19763149481.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/a9g3s6ugu34596qbslpou1bjq5/xodesiko.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/babizanizak.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b02f3de527---95273215100.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gogora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=auto+follow+unfollow+instagramPDF 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_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC5 10592 bytes
SHA-256: 8c8f89e99efe0ad8a3bcdbb423fda02f7c0d0be9e40605ae465d2721b9f7f041
font_02_sfnt_off00015409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15409 18196 bytes
SHA-256: 33797595d2883001726c982e2936f4c8a9e730a66296177d2d2e3b5ea0e088ee

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