Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de36fbb0ebcd0e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 23:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b7a7a864e1ca54523dfac3d59938216 SHA-1: 6feddf28f692ce89d6440274f2ece8b96ba4efa1 SHA-256: 86de36fbb0ebcd0e9028b410ecb3ab648ec17be0bfb825447ac6cb658ee6c9db
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm that points to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://chipublichouse.com/ckfinder/userfiles/files/fulufenif.pdf In PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210810130823.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/10329992344.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/xarujiruwujamiwopasel.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/354062247b884c24893a93042f9c248f/gemivonuvusobasujifokajof.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/51d8058586f8583c85e43ea3f0e84033/22282104357.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/7456890733.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/m8g8j6ueqktnn1gtv7frg1s6s1/konugegowitidugubibu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/32121506432.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e21545edad9---85948185268.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a77e9af---wevalozepabapibel.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fazalekokoxozos.pdfIn PDF document text
    • http://aa-nusd.jp/zuwivosulesunel.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17527dd49---gipifomiribudam.pdfIn PDF document text
    • https://equalland.com/uploads/File/lefexa.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866acdb868f---wofefoxekamisuwu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zuguxodepodag.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/widutula.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/71777664516.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4467acfe---jigofesafozagidalajexak.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a99ea562ac1c1829dd6ecf0a820d1d2f/42810883616.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a324618f684---kemis.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/dcne9mqtqlg6d8h5aan36gppui/21450377474.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/didolozej.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/todabotogukijowiweweves.pdfIn PDF document text
    • https://rosycaffe.com/file/13944839146.pdfIn PDF document text
    • https://samowar.me/userfiles/files/moruvakikimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=side+effects+of+amixide+hPDF 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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 17932 bytes
SHA-256: 1ac3d245d794b3b3dbe352d3baa7d90479c57277c4ecba9fba5cd18ff29e5cf8
font_01_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 10668 bytes
SHA-256: ebc64b59067d7133be63dbc613c8dcc99671120f9676ac14d9ee624fa2933aaa
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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