Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cfe296331859da…

MALICIOUS

PDF

86.6 KB Created: 2021-06-06 13:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eccb03ae6815d53ca45b671082845ff5 SHA-1: ce4812074848742a3836d786ac311a98a34b88f9 SHA-256: f2cfe296331859daccf1b04ecfa8a210aa58532088b8dc65b1d0b0782bce5848
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=defining+and+non+defining+relative+clauses+slideshare PDF link annotation
    • http://tourister.kr/userfiles/file/futevevifubezerolu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd81cafc5---11186006453.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525211612893875.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2v0k4kreleld1el1jua0qtb599/mixunojarudinofasap.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/fbqfn4on1u2bcs3u9t45jaaacc/mojif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uvhq7p2vr0c33o3av5m3utat05/numikoz.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vhijff4cfr1g7r3cbn7cfqmav1/nugawuxiwipexekulosubuzi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/42181666187.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/bexepupere.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/32255734976.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608138fcafc3d---61029870476.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dezuf.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/biwitisawolalupekaguwi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bdf2dbb6---64117663261.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dsm7mdojjodta7l5d4steltpik/vifijejeg.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/62570254163.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/28083514253.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/gigan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 5344 bytes
SHA-256: 792e3c63e1720b82b12ff242cb435d078edd5dea43e412fa5e7f19918828e800
font_01_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 13252 bytes
SHA-256: 6fd46114b2dcafc4e085fbb4c3201118deef680d312551c494eb4349dac86009