Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7476c7af1b09a01…

MALICIOUS

PDF

126.7 KB Created: 2021-07-15 19:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f49c9e44231db42274a026fbc9dc0d6e SHA-1: 2037ac488e40bb9eff9db25412a88ac39596d997 SHA-256: b7476c7af1b09a01e4974da2118baadecdc69631e1e0e2bf219fc36aa19937dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

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://ketchas.ru/uplcv?utm_term=biology+words+that+start+with+c PDF link annotation
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/lr7705hepelhman0obaf0ep43g/nilotimimasipig.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c9c4dd1e18e91026dc7d5b54a1359649/41277686389.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jidazux.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/de7039971fe986a20765434f06ecb3c8/mipitaripijofodajifuzagov.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cafce51cbc3---fozivofedifunetunuziwomuk.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5c53184a---dudegezepuk.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0832d42df8---96180143703.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6131e27bbddf20bcbae0e1f6ad04edd0/91504589804.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/jepedudaxikufozabi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0dad8cb0015c416d491651ed8bec06ad/66790724125.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080b85ad3903---nuwaduro.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8qsk5brqu5f89ld9r45nmasr0n/denovobuvuwoboseduzotuwan.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160795e7d5b971---57523287984.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/023d6a7ca40738cefbfb559fb0fd0291/19089925915.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/fa36e42b0e25406363afe5d663826132/givobudo.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/fuwimadobazanegoke.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/24207498735.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bv31k8mbhndh9rmpl13unkcf2i/4069678697.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779c19a3e86---mezevisorajaval.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/37978871980.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/52456330692.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/79569210316.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/538bedccbd4ffd7f07b743b68ab4bfb2/42185108938.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/67537083356.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a717cab72a1---42132666095.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a7095494426d27dfd474ddf3831ec1c4/lulifakotebepezukug.pdfIn PDF document text
    • 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_off00018932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18932 10668 bytes
SHA-256: 06cac621af8746d0b1f20372e0cd8100d74b6c4c97ba0248d4ed76599e406b03
font_01_sfnt_off0001a1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A1 19504 bytes
SHA-256: 28bf328b636315ad8e01fc05b6454fad42a28d0a6c0622cc7541379747db13f0
font_02_sfnt_off0001d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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