Malicious PDF — malware analysis report

Static analysis result for SHA-256 26862d2a358baff7…

MALICIOUS

PDF

113.7 KB Created: 2021-07-05 03:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ab823925fc5ec660d1848c04508dd4a SHA-1: a65e6f51be88a6504d6dc2e81d43fd935f4dbe0e SHA-256: 26862d2a358baff791b948343e559a29be436f6385351cbc14417142d791c379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=english+question+paper+for+bank+exams+with+answers+pdf PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3e8752e2e74596f5d7806bb50d25808f/tavesi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b1bafddb---juzejoda.pdfIn PDF document text
    • http://wamer.org/userfiles/file/20420828541.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96271683128.pdfIn PDF document text
    • https://actorconseil.com/files/file/vitawadogesafekuwilukel.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/86864574512.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10e36eaeaf19744c8010fb7391005d00/35998268238.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/63708251236.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d9480de9---zodajagerawesobiji.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/3729454746.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b1ca8d9f---8070870799.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/16378549816.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1cb49a2043173dd74d94e3b4c608bd09/15434777837.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9421c20c8---fazasotiw.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/zuzibavixun.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/diwenedo.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/ganimerexanekekewotez.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7e018922679472024785816fc2b5fdca/fowolutuzajisafezuda.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1g11ifh9gin28dtjalevf8htv4/42003422512.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/zanotabul.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7hrjm0v0dkrbkopqbtpoc9oh01/21559585645.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c623dc234f99b22d75c3da40ed6e2487/libozofaligopibulimifu.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_off0001575e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F70 17908 bytes
SHA-256: da09f81ddcb54367bd1ca17ca88b06d87c49f4a54a3ab276065f54f895f81de9
font_02_sfnt_off00019e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E76 11596 bytes
SHA-256: 5b1b355a7550822811744c7d2e05000e076fd75d55694f79050a6baad11ece83

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