Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1949cd6eac71688…

MALICIOUS

PDF

110.7 KB Created: 2021-09-06 05:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a0d518883d8c4b74d9d6881a7a272e7 SHA-1: 8919eab850ed55a8d8b25b13bedf3fd5e8d0e959 SHA-256: f1949cd6eac716882ff02d4a5d9a6b6bf79074c44453f24a3d0464214989ae75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://allytemp.ru/uplcv?utm_term=ruggedcom+rmc30+user+manual PDF link annotation
    • http://bmsorganica.com/userfiles/file/selefagafuwegabowexexig.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/18581344839.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1b354125d68573b8dade1b294979e020/vobis.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/2367646962.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c8e9b815ae150d0fcea75b0675bb342/38129030412.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0ok50sgbd771kgf29seifd9967/pawimeroko.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/85557479129.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/55248449776.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/serokodemexajepotamemux.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dekajit.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/dusetukevo.pdfIn PDF document text
    • http://stl-hk.net/userfiles/lunabulikaguw.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/muzixumekodemupatuxe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0rpo4u60hf2jpfhod4kkv4q684/93563640490.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ed256cf80d110e647a33bff86c0f51fd/50716510540.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a56908dda---letidi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/135f8fd253f6a366063767f34c40d731/tisokufuwudo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d3fc54b72---88221810720.pdfIn PDF document text
    • http://airfa.it/userfiles/file/wokosonukevusore.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160824b14b2eff---lapabidu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/rajosevavuvunojewesaberap.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/15997113842.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8pkbcpc82v1e600tc9q4l3ct7h/voxetavatixubedarev.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/fovunu.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_off000149f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F5 19088 bytes
SHA-256: 10acee9656b7da0981e1e27f3b43f63a7c1ca40c97c6e84fceeabb03d38eccc4
font_01_sfnt_off00017b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B64 10960 bytes
SHA-256: 71c7a28c0a1d3a04976c48e18eb7c928b001cea7f054f292e9599e62577246c5
font_02_sfnt_off00019496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1