Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39bad304d961bc2…

MALICIOUS

PDF

100.7 KB Created: 2021-08-11 08:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de7698078534ff7a205c5970de5b580f SHA-1: 9564ae0751c97249b2dab26dda4c9a869efc3c82 SHA-256: a39bad304d961bc282fc3d26cd31fb7979ec4e260d275b7f9dbd9d890e4c9bf0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/89672484bc2d197683793afb2f494cdc/semefoxaromot.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wimukutumapasot.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/er0lj62a6g9be8cojd6mpm9tj3/wiwibizekavo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/88306903da2610127f64d16d363bc1ff/kukiperalokozugoxabo.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemalimonepenipolop.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/gikexipak.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f1834eb0---tikaropuzom.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f084da7b4---xinuzuzi.pdfIn PDF document text
    • http://msiutilities.biz/documents/wujujojujikerarob.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/bojuzaresekejapinewina.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/81590624173.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/51364701890.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070f15879c50---38229729252.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/fafaxejojelu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/12695840766.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/624e634ac14f1445dd6789b0bf0ae753/pilusetujowokodijutof.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e196d56---pukamibejelago.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/8784602481.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7fc75ae8---bitabuno.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/83309436619.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134e144d29a---tosirizofe.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160853a324bda5---77302169673.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89310167480.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/54719756088.pdfIn PDF document text
    • http://greenbrier101.com/userimages/5233819353.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/16992203589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cartoon+movies+3gp+mp4+avi+hd+hindiPDF 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_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 18552 bytes
SHA-256: abfe4b0860fd63f77eb1e7addafe24bfdcb3ea1bae9821aecd3815a4b92dd63b
font_01_sfnt_off00015194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169AB 11140 bytes
SHA-256: efbf6a15edd9cbed9f65a2cb5ec9971c9f46a6f76bd312fbd5d5a04aebbaa8ee