Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fdc086f1a23258…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 12:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a5a9c849f8a3c18831961689c5eb052 SHA-1: 3020523dec314b9ee55c3b32befecd1542aaae7b SHA-256: e9fdc086f1a23258e24cfcb03b89fb8665db341b5773f5df516f6212d0ad69ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs that point to potentially malicious or phishing websites, as indicated by heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=ebay+sprint+phones+no+contract PDF link annotation
    • http://studiodispirito.it/userfiles/file/defagobufinazatuma.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/94388411036.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/205cc15a0c37ce791f4710e294d5e6f9/ripusuvuxamemewuniluz.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/27927929381.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/85469579631.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/89954596142.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/20837630617.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/33142171953.pdfPDF link annotation
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm1obsutru5hbpk6lh1pj8knlm/58467170883.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/55219514922.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/13643726630.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selurujogi.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/bigudepafitiveduwumusewa.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/23202965300.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sesuluge.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/lajan.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/xefazorinutixadun.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jegowutepudele.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/25128205758.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/jibevitidijapuverujefajuz.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/78662301300.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e3e638202572c63fc4d74c14b050066b/16150051256.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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 16100 bytes
SHA-256: 839ec1e2e9aa477a548ed8c7590642148781281c5d178caa55abd2bbf7d7803a
font_01_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 10664 bytes
SHA-256: 022a420d89117b2087e06de8ff0531364a8dbfa1707a78697a4f099428b5a1e0

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