Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab162db399a976e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-17 12:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3964d47e296f79169e735b28c87c7d84 SHA-1: 7d9d742c1c9fae50bb7c818fb018ef2091cdf57f SHA-256: aab162db399a976e5a5124123df70a08bfa587d9419bc6c89ad12c8a2e202878
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating an attempt to redirect users to malicious content. The file's structure and embedded links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3d26f019a2528327c55f37410e51f46d/33501180982.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c525d94e15c8e6a8fa9997ca24b78afe/54988693583.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890d99c3819---rosifovuxiritegol.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/82774223369.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/12383483167.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f45ab7901---buzodisoxipiforalidut.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a3c931f7ec4018f9694eeb343a0fd59d/popipolekakagojepoxarafo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d47db2453ee---keloxopazo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160872a45473ba---nokuk.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626206922.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/debtq1r3qtsglugeucu8lfieh6/56360071810.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/gobiwavifumapesekibumeg.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/60842947373.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/gipigafovafilowomab.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6bbcd3fe---6427610941.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/30514825563.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082130875183---gagawowawavad.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/651a02d9abfde2c7ae7150d7b29da26a/vutimolixoboro.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/87fe51fd734c86c5f6d58c6326490ba4/15313104200.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f9mslrciru7jtkpt9ts3g5ifph/gokojemuvopurowiwufesug.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/4811418489.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027a8b91d1---73934415916.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/joful.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/67190850008.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/4053861559.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/salokesofer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=coach+yourself+to+success+pdfPDF 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_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 17852 bytes
SHA-256: d3eb15ab7d83070141abfcb70df53e306c2d754f8a2a8da1dff8209223aa3640
font_01_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14305 10764 bytes
SHA-256: 8884fe86d6715171014625eb3d9ce6d0427e0165ea7ca663c8da115f54afe734