Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf2370fa0b80aa9…

MALICIOUS

PDF

67.9 KB Created: 2021-09-05 21:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88bff0fe7082bd82e7f91c4ab41c3099 SHA-1: beecbc724a9f154a410043ee7f58dc2dd3bb544a SHA-256: cdf2370fa0b80aa9117d2fa505178054af074dd49dc1f50f97ec1cb21f405846
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm indicate it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://andana.us/files/files/28481627411.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea677675d6---loluderavivijeziruxep.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/14446208313.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/5305347157.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2464865e0694db510e69895054f2172b/jepuxe.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/17047772171.pdfIn PDF document text
    • https://foulardfotografando.it/file/komuxisajukisuri.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/batisudobawiwa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ee9482b752b023a0e80b6adfc5bf3ee4/29587312149.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/pawidagotorogenisadepubid.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051717114771.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/kejegu.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/fejoletiluruxitenanikafir.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc82b48e97---jenejago.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/59286767159.pdfIn PDF document text
    • http://usmleworkout.com/files/file/10502465689.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/wogukefi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/limitu.pdfIn PDF document text
    • http://fittbike.hu/files/file/gunaduben.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/pidudaz.pdfIn PDF document text
    • http://merwepizza.com/upload/file/19613613200.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/eglsrf62fbdg2hhr733gvvlqg1/jadizofikeniruwokogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pectinase+assay+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_off0000ada5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 14792 bytes
SHA-256: be83a46ab6d01e25d8dfdebd920cb7b19345b56d26621dc597a9fc9ac73c4f80
font_02_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10464 bytes
SHA-256: f393cdea4e34b0072195ce8689b87801c41e0d6213f0df73bd678e54cb98255c