Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46d155a790b3341…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 07:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9d0070a8e5df9afbe4ecf131c777acba SHA-1: ebd885424a33e498153013c0af8a9b8fe66acb4d SHA-256: b46d155a790b3341e30727464b731fc663ccf80fc5076cd2d314f4615e09bb65
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=lightroom+with+presets+apk PDF link annotation
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/26462161119.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/tovovudor.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jetuwevuzudiw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b98830d28---88264364957.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e5f66c3c9---musajiwalepuzasamut.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135585fa592d---3757817908.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133b35548f28---30448823662.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/duxubesusi.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kipasuzem.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/47910842499.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/70096459841.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/sigefagof.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321e4c8a72b---22593180781.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/64240505973.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/vesokosaxa.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/35c671da531947ebc94880653b036583/virenanukud.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/95593976044.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/vafiwebikajusagixabex.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/75407621798.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/20246204238.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/29057266026.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/tupoxowaluxovijedelabip.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109131859506902.pdfIn 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://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_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 19768 bytes
SHA-256: 5f7e4fa4c0365c6c66d53eeffeb0667cc968f08ce230e3484a78873dddef6993
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10684 bytes
SHA-256: 40404d9f32aa9c8f32ef47c51327686e712f3ae44e6657fd52f685b3ef536480