Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee866b4ae7892fb8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 00:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 788a23054c22c344fda519b57fca792b SHA-1: 5d202a2c06ab5e429c80df4b7b124a6bf2761657 SHA-256: ee866b4ae7892fb899e7540b355e21e5ad67b0e322ee0ffcf7eb1e2369e3f736
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of URLs like 'https://irlanc.ru/uplcv?utm_term=unscreen+pro+free+download+apk' indicates a potential lure for downloading unwanted software or phishing. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=unscreen+pro+free+download+apk PDF link annotation
    • https://istanbulbalbir.com/upload/ckfinder/files/nidigibawugunuxojusupo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/38ec7ec028fa6c8197153249aa09186f/dojapid.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/52444257988.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b343aed49d---43911790446.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4045040e3e38599480aaca73cec794f9/jogutotavazur.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/matifepoloxig.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/nusug.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/48170122092.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dfdda321---19972393103.pdfIn PDF document text
    • https://weingut-suppan.at/files/78818675455.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/55403442776.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/51325189327.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/22689699650.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zoguwafotegelezojebiz.pdfPDF link annotation
    • http://pumarecovery.com/userfiles/files/85784300370.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/zadelizateviroja.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dazufapozir.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/76827722941.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/17967245396.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/20591917684.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/felufisu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jizumataletinap.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/mukumoxelimeteva.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_off0000b5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 17948 bytes
SHA-256: 94ec5e23cf7739c41503a940b5bc85aaed4092defdff2518dae51cd1b45fb9c6
font_01_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10608 bytes
SHA-256: 15863d2855d2c6f55fd3c49c37ea43410edd0fb74f88baa31454b68d36c22aed

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