Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41b4c5afab56b3c…

MALICIOUS

PDF

97.4 KB Created: 2021-07-16 14:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 500c981f09e27851c3ef5ba6cc48fc5c SHA-1: 1a5d4496a93dc728c7e45d60918e5a5d2f01e742 SHA-256: c41b4c5afab56b3c294c2bdce9300920f66b13eeb34192e1a81c04d6ce4569a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, designed to redirect users to potentially harmful content. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://imssp.by/data/images/fxeditor/file/56041290480.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8d34d82c---64721745649.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vemonopunijiramaligu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6940c911---vupubisujitukukupado.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e83lad2o63hvns4ba19migogn9/faranogefimitabaxaxox.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/htepojg4sqjnfrb6nm0lfsgit5/xavetulofajutudawob.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c5dd3297---34487407031.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845aad04a0---88065482625.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/45344034501.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1aa3e6c8cb680497d9e82f282d6bdfc1/88519595084.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/964e114b77fa0abe1e4ea15cf25a751a/20407396469.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607782c032d01---31369076921.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e371764b8---repiwiwigisiwetivu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070935abf80d---23510688484.pdfIn PDF document text
    • http://cosyromania.com/media/file/52632607971.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/guxum.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/zikudibiwimalisi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a4417208---zalokuzamologevisalok.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tikerurojegirexu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/800b974b5411aa76fc333d8bf68c2278/95415017034.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/13105229495.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fce52f1c---68287673668.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/31067137025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=crispy+pork+belly+on+the+grillPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 18472 bytes
SHA-256: cb0c2a2258876bcd0f61eb09bc38bd5b0a94bd7317817d92b0242c8382dd6997
font_01_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16876 bytes
SHA-256: 35c28bc5a06b6065c19b706362e8b237e2c24ac5d3263f1ac3c5dc0fdf7837cb
font_02_sfnt_off00013e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001565d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565D 1824 bytes
SHA-256: 065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
font_04_sfnt_off00015eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEF 10744 bytes
SHA-256: a3d32b89c86676610758f77a7ebcb9fca4ff0219560889b82b4d89bbee5b051e

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