Malicious PDF — malware analysis report

Static analysis result for SHA-256 306a719371dbf4d4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 08:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae83e397094a1069605014e0423fec6c SHA-1: 607ca96b9dadafbcd1317788a5841ce975adb496 SHA-256: 306a719371dbf4d442b0f59d1fce4926c0c4bd82676579bc228fe603f5f17004
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726e426836---45670555604.pdf In PDF document text
    • https://osikovo.eu/webroot/img/content/files/nopotoxu.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/7757197101.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/fafapifakivinujotupegudow.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kejafovezuxawivegi.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910050402.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/02/tebonil.pdfIn PDF document text
    • http://synphabase.ch/upload/file/2702014305.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/41143324937.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/24036713001.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mapuduxuzatimeti.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/61160492886.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911220632.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dv55urnbbljjdjn49u79jq30i0/93966153625.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/80280074542.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/towewidutebukijose.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/vakonoba.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/nubatonijiguzudijefi.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/repumigufilupabebolil.pdfIn PDF document text
    • http://belean.pl/userfiles/file/63416175620.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f446807a---xosinipifadegebasewafibu.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/59960639080.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/gusakas.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/20529235304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lesbian+porn+games+androidPDF 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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10688 bytes
SHA-256: 5f80258d6b902ab35914ab44d7a3cb6ead9b7adaa84b2be6328803ba3f52dab0
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 16440 bytes
SHA-256: ac9d7ff7374e8dba8f27944a337d59d9471b3ab6bce3d41b19dc2482b8c8922c