Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a063e76f4087114…

MALICIOUS

PDF

99.5 KB Created: 2021-08-06 08:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c541bd0ca3160649a37849af4126642 SHA-1: 79e2d94485746470d9f502818b753cc67ee8437a SHA-256: 1a063e76f408711449c478c038fb1b14c62594f24429f077bb28c9e438cc0452
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The sample contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bhsbeacon.com/FCKeditor/file/53212492683.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/07629945e3575c8e0804bb9f55da1aef/89863497736.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8d2456ff---fufinaxotijatipevojegil.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3ubcao6bullgm1cnsqda7kiou/3461994294.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/poxefuzenufatixew.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def551a0d5a---55767820115.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vulumugopopimimilite.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c753878ce---bigegabe.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/desifujatesa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3bf2519d---94140881327.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/fapanorisasawuli.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a449243b181f7227a42a8a91e1e0aa9f/vefurokomowapomedobop.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bed732cd7cd---49234572123.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160891b3c2d4d6---829380375.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078155ea59de---kudegozumigiw.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160797f7de96c5---varevolagowuwigizew.pdfIn PDF document text
    • http://camonetinternational.com/files/file/muzoxo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512075453906.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4549909e763e37d2f400e823c57a4a93/bubasiz.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/4vhk8haphfnbbgh987u12i19cq/62098225953.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/losagewuzinupusuzetixime.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6f9b92057fcebaac59c06f9f1ed31542/90466995813.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/86015788162.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/efd4495a14ca804b0d36bc348d4e2d8d/rugovijalofi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fitulumetazawibati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=2012+fiat+500+lounge+owners+manualPDF 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_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 11076 bytes
SHA-256: be34078e1ba503d395ecd0acaa2e172427b005f0e749ab7152125ab6d559e191
font_01_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 19932 bytes
SHA-256: a5f7533cd21cd8269229098770dab219ebebf01a9332b89e1b10a519046fa08a
font_02_sfnt_off00016758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1