Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a901dd4d714fcbb…

MALICIOUS

PDF

73.5 KB Created: 2021-10-14 00:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e88b481ea325502e70687fe0d67b6dd SHA-1: a1ce4c2ded3e5491601979eab7b370a2bd8f8e12 SHA-256: 5a901dd4d714fcbbb7cc72644e737f46e50867d7c20b2b8a53426bb16facaa98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The file's structure and embedded links strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=class+conscious+meaning PDF link annotation
    • http://unseenadventure.com/userfiles/file/girutokonuxet.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dbfcf6b5990ebc82f638374dc7b0bcfd/106246719.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417bc0e0f4d---74502151870.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d050126bf9228abd9d8cc932f7291224/bevaxowakozosikawiwo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/temajeneju.pdfIn PDF document text
    • http://hidramaco.com/files/files/66609829546.pdfIn PDF document text
    • http://techmechengineers.com/uploads/lovidepojidifozalesi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/21b3797f945a43da063451f6f5d1b04e/wukegowagoxixa.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/57494090231.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/95566589068.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/fepinutokodunoj.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/59777092122.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/seruxanilonotoxilozakabij.pdfIn PDF document text
    • https://ww150008.linebot.net/upfile/files/20211003081903.pdfIn PDF document text
    • https://esz.jp/img/editor/files/72931809696.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/99081224868.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/kekiwu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/minobejusovaborigirekomew.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb641ed28d---subaweritegadixe.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/9369192179.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/lexiwamapanexewibada.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/1717394542.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/32021862780.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 18952 bytes
SHA-256: 6a8941546a076490686c8647702e63c31438e50a0fb8df046b3566adede50d98