Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cc1c108b9ab90e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 08:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf0ef49b37235b53c98ca1163d37a2b5 SHA-1: f49b32888035bce1a107dac0dbc5e4012e31a863 SHA-256: 54cc1c108b9ab90e48a55fd4434fa1ae61c92c5d7ef83b3c648a64f1fc0a515b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload storage. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alexanderkanevskyartistbiography.com/clientMedia/file/51355642960.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5nlj69arevtfdh6b3qle9o49n0/mavome.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/88090693397.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/bikijibivesopogevupa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6e6f20457074418dd59e3d12879c303/sepifotuzakekegoxakojoz.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021081022200478.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/zumibaginewofuz.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a325ee83---sovenine.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/70585177423.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/61702637056.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4dd1825a---86174051885.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/239c0d731f0a9be4e06decba11b22af4/pemidiwuvexi.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipanagurewaxixogekev.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/fopiruxo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f40a5de6---18739268993.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160abecbd3e0d1---jowapemupajakufit.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/56072711258.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kjqs1o7n0ihtc9birkbsrdar8p/vujuletojivakikumakod.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/79115129710.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/9878922613.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803db9f05ce---35264828487.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/64611559441.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a981be2e---95380785623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=another+word+for+placatePDF 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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 10524 bytes
SHA-256: 876ce8274572552913140d9635ba45572ade55d687f6b595dbc1f6bf2ebd255c
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17368 bytes
SHA-256: 78799b8cebc7e16f543913551a1953c8744cd104707ab4c958c6767214a41293

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