Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fc0149e43d678e…

MALICIOUS

PDF

84.5 KB Created: 2021-08-11 20:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b05b5bc018f6006f22643f73160fa4c SHA-1: 05305a1afe18160a3afc068c77ccc4e52d428e8a SHA-256: 88fc0149e43d678edad5feea7083be5431494946e8112e3b477448b21f07cea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS upload directories. The presence of numerous links and the use of disposable hosting indicate an attempt to obscure the final destination and potentially lure users into a phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0ac145ab5d6d51357e5c9306b5949b55/zixagewetaverugebilasoxe.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9237f189ff---sezer.pdfIn PDF document text
    • http://afslab.asia/upload/files/46318378069.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845532bd7a8---sozewivududowubaxopitoxos.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/nazebazuxa.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/ruloferirifedibafoma.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6e0c2c98276fe54cdae7cac628e23ba5/74589505799.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/xekimesewumejasigegit.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/43131055122.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/34376393925.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b65d04f54---rejowulubibamusitim.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fa12df0a2---10856917881.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/32bb05b09ac344741e79c97c18f9ec26/48048684758.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0513haf572piifgan2fjnbtj24/satuxefo.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a37f462ad189187a372a732b6055ede6/fiwodojawa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8aa954f130e2818b3309bcb8965a7875/28957891096.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xuxixenimivufapoxe.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/nuvipijozemuxonesu.pdfIn PDF document text
    • http://lukinserv.hu/file/wafudubir.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ee286618---42159601847.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86907563c0---96096207794.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fpoeqk6c8j4rnbuuk9jjd4jfl5/jimafaleva.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/guwonemijulon.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7vc2rbl80j7dmckbffspjdffl5/befibudofakakakaku.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fvbbdhq3t1d73k4999pjqc7i1m/90437163327.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/43716000125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=verbos+que+terminen+en+illar+ullar+ullirPDF 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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 18544 bytes
SHA-256: fd4e582896738de70b8f3cab3192c2479095807beb65d43b71e8b308092e24f8
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10624 bytes
SHA-256: b99e544dacc8c1e9b13add681660935bd2870bd721d1e6bc4e839b3aa4061558