Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf863560186a820…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 10:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa2a33f07079a6dfcdae20945905c708 SHA-1: 1c8b25a62995ad2c5907494e7de94df4ce1e2efe SHA-256: caf863560186a820e6001ddb782dd54dad057c8e5267be57a1abebfe5a5b8335
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links to external websites, many of which are hosted on disposable domains or compromised CMS uploads. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://edwardlankin.com/clients/86087/File/73649767468.pdf In PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/13765803959.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/28128062086.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/fubemisofitemaladawudefuk.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6fb7ee82b76490e71d0845ecf11106f3/30008113973.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/92853308034.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/18206183206.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/21480348981.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/58042385536.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8ec96674---daridoronukidaxuraja.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b889f072b15---pedikajetoxuzukofosube.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71284574046.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718d2932da0---10112302320.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f6052287da6e26f7592a2e4f2733c202/lewuleradafebevowefob.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/85071762654.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16111892219a7d---zimesezinabusevewelelom.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o2h857gkjpj15bt003s8klak17/51405111952.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/36982363766.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/54712640029.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6059ee2d---jasatakubakezolakekazek.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce62d2098---84194008721.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mivaxexugozuxox.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/41535862914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=coastal+processes+and+geomorphology+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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 11120 bytes
SHA-256: c5c6bab37dad9b0ce4350fefe25331b804bd9182f86f47a4408a36e897e8f112
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 17164 bytes
SHA-256: ccaf9e4ba3d42cc7ffae1cae2c998fd8ea7720025a819e028e7b51271854af48
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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