Malicious PDF — malware analysis report

Static analysis result for SHA-256 6378a82f1a908b72…

MALICIOUS

PDF

79.7 KB Created: 2021-06-13 12:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c29a59f111f365b57879799ec7c834a8 SHA-1: 65a666c43bbd5bb4e00d6cf214d24582381a9659 SHA-256: 6378a82f1a908b72587e77d547b8f68b150aad749fdf53328874b266d9ffb83c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malware. The document body, though heavily obfuscated, contains references to 'chess offline apk', indicating a lure to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=chess+offline+apk PDF link annotation
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/35452542418.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/30773233348.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cde30d2f41a084e5ab3a86007c84befe/sinoxiduzonudetuba.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/df42d0e532214e1fde8beaf1057046e5/bokawelidaninanuxipuwo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/wepun.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210508160406134.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/pejepufe.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a90a33be251302e0bebd4131b62f7c3b/bolowo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a68a496714382adaab8d60037bca9b62/83188416630.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kemamajadusujuk.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/71686582746.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/75860cfd2ccdd49e1095fc0d0de7ddae/pefavokimajamewu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/53714eb055a800f256071b8ffc439a78/89448275387.pdfIn PDF document text
    • https://lasanisports.com/files/toxupi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/5624930569.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e2938c66feddf3a86784fc7d9ce5af09/28714715186.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/33094463942.pdfIn PDF document text
    • http://hotstamping.pl/files/file/27655433858.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/bnbioua54bo8v7dl9ulb90l5jp/kamaworatusafixipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 4864 bytes
SHA-256: 402295710b0ea7f8af88ca01cfe9fe60c10f0bad19e3812b66ebdd7c91eece6b
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 11100 bytes
SHA-256: f952137071970345ddbca2f3f02ffc453eb9d35c30d3b4bbba4b0424908f2d7a
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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