Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb2dbb6f2298517…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 17:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67f6295b3460789416e2d0d29f8bcf54 SHA-1: 050cf9a4e4d6c0f98cf98f6046656c3363dae503 SHA-256: cdb2dbb6f2298517eb62fdd09591d0623d7d29b09a2b9a861e2bbce103ade197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS upload storage. The primary purpose seems to be redirecting users through these links, potentially to phishing sites or for malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lapakunited.com/contents/files/wuzexijexizuma.pdf In PDF document text
    • http://membranekeyboard.pl/_data/file/95989302159.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bc33b7061862891634f04c3bdc0d2b8c/28309884775.pdfIn PDF document text
    • https://belloverde.net/emailer/file/kawupabinekigivemubadivo.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/76200008681.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/18076609103.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1aa05939217010d7994fb8127b2dc836/46613585817.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea0ea37f7---51925803473.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/88589187270.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83b1c0b6b---dufojewe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d92ff3c1032f1c631c2cc88658ec28a/pagisazupevel.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2166cbea---zatikerurebozigomibes.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210808075251.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/50194bfbc4d2e998e62083a59f6fd689/34462743294.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701af7a6207---96450384500.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/63515327947.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/43761823814.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7e0b6baf678c37189463b479903c3e29/nuzemujogivi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ae84da947268c4ad35079c8a9cdc03a5/jujititasor.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/49828705874.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/kewamomuwopugi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b012a64466b---jupefovujatebowavax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dangerous+liaisons+play+script+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_off0000bc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC54 16896 bytes
SHA-256: f72629f0c5a59e2a75ca23c712db787101e6e2f729bd719affdbfb082cfb9116
font_01_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 11008 bytes
SHA-256: de8e9c30cf4f0eec1d8f7319a2686c02c3d1813d97766c74034e3fbee5096bc2

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