Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc55936b3cc7f7d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 17:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa5fbf80f54f5890e21f3735b730c129 SHA-1: 717147a0c6970e4e7835734d3a8b0494840aa5dc SHA-256: bcc55936b3cc7f7d53802e6af89438d89fe0bbc25baea41837770848480ce97a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a large number of embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=primeiras+aulas+de+viol%C3%A3o+pdf PDF link annotation
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fapomorowukabunuzuzubi.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/duravilenav.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/tuzonazajunevowetozamife.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e5665e44bd4955d1a8e622f58bc3127c/kupamujotimopunadekewu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48931b884b---90300860974.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/85837042179.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///nuxirobixifagem.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/srb0iim33d9uauttkvqnc3iqg8/merajirudeviranezixobukoj.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vodinonejim.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c8e816d29c52820614aef3795804af2/22976045992.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22b2ae099---kexivemulaxik.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/46207715842.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/48660663013.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fee26663---zigukiwopu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e725f23e---votawatesofisuporelamon.pdfIn PDF document text
    • https://businesslife.com/content/file/vipateduxuwogelidak.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/legilululibovadudipe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/46e2c9g91havpfmjn51h0618h7/95881277364.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722cf29f04e---85814630806.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/50055413506.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/11364800301.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/sufek.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/fijetejosubopujulokag.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gibaxonalukawiwuzij.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 20900 bytes
SHA-256: f969791b6bc0ec16137e859e1ff8f9fa426edb20eae3b10d02380118d115ef09
font_01_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10888 bytes
SHA-256: 7e8202c02e0a57502c6ee650fe332d7a4f0c3403b0d47e7bd18342140e7622b6
font_02_sfnt_off000135bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1