Malicious PDF — malware analysis report

Static analysis result for SHA-256 68257292c298630f…

MALICIOUS

PDF

83.5 KB Created: 2021-07-30 04:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45ca2e84556da2030ed78240f56eaca2 SHA-1: 5113a905d519561e9a08a1b3220db41d8d9a3d5d SHA-256: 68257292c298630f9f5e3580a2af9ce7de2fcf37344453a12ddd9bb1343b4b6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=what+is+the+tone+of+blood+toil+tears+and+sweat PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a6196c99---zekigovepovogo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dovibuzedofosuma.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sohqnjpvq6jtua3k4ppdcml7ag/giked.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c16bc4b82558b7d551e8630222c391b0/mitomafaberis.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/kuxil.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hp7pkgkmrc61npr1k0u13p28nh/54133646424.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2b7b26e0c59c8a51917466e9076ac5eb/ragupugoderupafidudugeja.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8456108667---39161680702.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/18743253109.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/35415223133.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pilujekatoputero.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/da2e3a3ec1ec41e06b198fc144aaecea/28513290789.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bbf879c87---51521454653.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/84898817404.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bfjvgmb0jd19v4e53mboebr8cd/16761097498.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zukevebutapepalekuk.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/6868317488.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/ligomirunixokivijaf.pdfIn PDF document text
    • https://mszukam.pl/dat//file/liloxafulokanevowetaz.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/favodukipexemobu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a26b4fc06---26816298836.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/90254164817.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a4884d8e25e3961eb6637b6e5e4454bc/kuserafolesito.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 17488 bytes
SHA-256: 6d95a8ab24f8593a8607c67ca074aa4c9506bc0936c9f9fd3ab603d5d747d0e4
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 10668 bytes
SHA-256: 2f6097e765c832419e41f0031f7019a6e5308c49c16c32649ca9491fb82eb3f3

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