Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33095bed2f93c5b…

MALICIOUS

PDF

86.8 KB Created: 2021-08-07 19:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c6a8017342a98a2f01b7c268916e2e2 SHA-1: 105d81ec690835d3b9ef16593053d6ce3bbbcecc SHA-256: b33095bed2f93c5bc7c15f8ca2be50a6a897f1c2adc0c6f2072779af3d7a7fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially for further exploitation.

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://inwebjor.ru/uplcv?utm_term=is+tea+homogeneous+or+heterogeneous PDF link annotation
    • http://crabandclaw.com/uploads/files/bimemamuf.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f7c374b6e4bf3abeda6712a7566576f4/51362249576.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429052853198908.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/rovirefenumumenurubesolo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mesulif.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/35134908448.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/229ff79cad5b48376629a02560948528/visusilizixasegakefemo.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/sudevukamosekokukusele.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/32521474792.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/cd073cfd337bae6661af248aeeecbc4c/2798215014.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/75980283393.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/losededubopunodafavu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55333178587.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a292c93236a---nebibufilifaxulivoxofi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/49e3da813ad1b2ec4d9d9ab8c35a51b6/45422248650.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34e987dc1e---30384176335.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ituk5nr49t5d2i0pv8dj5g470q/54704689565.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bilijuxur.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/39689007400.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6897dc36f---rinuvobogemutetuvotax.pdfIn PDF document text
    • http://pk.mo/userfiles/file/motofetorofulemaba.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3894416f---99069528396.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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16980 bytes
SHA-256: 52784dbe6484b3847f8a09c4bc35bbd20af46f2b1463d6abe62865325d763bce
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 10468 bytes
SHA-256: c6ff12dde1c7fedbfe47b069bbbb924eaa8e2675f7d56b3148e2facab47a7e20

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