Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90b0bd928d560f6…

MALICIOUS

PDF

153.6 KB Created: 2021-09-04 06:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c6ea7a26c50cfe7556917ccfd4ddf6a SHA-1: 045e8625f3714911f1d8eebb68c68603917aa9bc SHA-256: f90b0bd928d560f6b5d297aed6099b368c922a62c6fc00d6f6ee93df015a11aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing campaign by acting as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.astmalek.cz/obrazky/file/xivabuzarenor.pdf In PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/78134291453.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/5046718356.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/tudibelulepujasari.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160834bd30aedd---dagefekus.pdfIn PDF document text
    • http://fotossc.pl/_files/file/tavigarupixakuwem.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/sorokenebolobipo.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/jerevuvixefatudufawaduka.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c9f8c9a846ecfdab7124352398a1edd3/19421146792.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/76438113290.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/wuzotofofubudujosan.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d87ef921---pinuxegokajixon.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/41197679276.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d894e6c67---nuvimunova.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddca7013853---29651874246.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/ragogijomiwatubozefumu.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/59684277671.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/3821462486.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/77001917689.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbd56e46f---59187804649.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/20285800440.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/45736275499.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfbe08fa6ea74d54fbc2a56972f554c6/80130882404.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098429886380---fujujemizopunavatidup.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ca12fb8fcb888a6e1ef8350bc652622e/47924656132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bakhtin+marxismo+e+filosofia+da+linguagem+pdfPDF 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_off0001f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000208ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208EA 20696 bytes
SHA-256: 222fd44179bfdd8afce495368b5ec03ad5f214f4fce349d87c530090602eae86
font_02_sfnt_off00023df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DF2 11292 bytes
SHA-256: 708af65d6f1d71cee213eed5a097c19998f8707e5a4edbc25d41170c7f3ba351

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