Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e10c38358b8e612…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 15:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbd0241d27f7ace8124f63d2fa8af23d SHA-1: 87785f9dac31212d139dea76c5fbf7716126123e SHA-256: 1e10c38358b8e61248e2523ff3b9d0ec4976d6b027b69e91a18092db3015426a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or SEO poisoning attack. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/91el1pe67sjbbff14ffjnqiqbk/35325938085.pdf In PDF document text
    • http://ccsl.asia/files/43594574576.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gijezaluvazowebajuvok.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/98159524321.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/89731703181.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/61687022014.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7k0gf91ub3u3p3l313nukvvhn0/tekafalijamesa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a0397bc8c80---45824788119.pdfIn PDF document text
    • http://heizler.hu/files/file/gesatefupuvodum.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/261tmvvg8s2kakvuuvnf141j13/59704488484.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609217795560d---gidijowivuveginifan.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqeklta6q2hl9goooep7jo3a67/3275454555.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/27188136513.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/60022786802.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/5419508295.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2pjdu0lhrgprjmnghrfm0k2dc2/90633918318.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/gawesiwexezowemezafuta.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/jokunojobotiziva.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/88318189224.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c02660f6c---lazujusupi.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/319354843.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/kamonalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+many+types+of+preference+shares+are+therePDF 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_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 17172 bytes
SHA-256: d7fd5d66dfb0abe7ff5ef03db918c7bc6e076cd8be8e1fe49ae00fea93fbc7a1
font_01_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 10796 bytes
SHA-256: 29ea324984260b152bd7567b37c668ea5e4a51cf3f0d58577f925e0d17b99028