Malicious PDF — malware analysis report

Static analysis result for SHA-256 33259be77a8cc110…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 07:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2019ae04a8674c78111c28e4304e436b SHA-1: 98a24b0c336e23236b57281b8b15b32d5380bc0b SHA-256: 33259be77a8cc11096b6a8039ea47ccbba472762cbe5572282f008a18f39b156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure. The primary attack pattern is likely spearphishing attachment, where the document serves as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=imagine+tv+apk PDF link annotation
    • http://hondatayho.vn/images/ckeditor/files/vojididelojik.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/kazevirutujaveseri.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/buvakuvagutofigaxujutofez.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/wotizejafoxofipasujikef.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/520626165.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/67786338188.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/97125379336.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16133a668934a5---27641361431.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161477a210c1c7---luruxejuderud.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/19938955643.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/newalofogisujomuve.pdfIn PDF document text
    • http://dolonchem.com/upload/files/76811799694.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210908012709240303go1t8t.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/kajog.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/runuxafokowazoxotudo.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/xavadalowajul.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161439261c69de---lidulejegusedixutev.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614099ba7b7a2---fulokuxonor.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98527621824.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/27314326546.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/koneseruwinufepukukoz.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/pireligarajujivokugun.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zetedadenalubovezagaxira.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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 17180 bytes
SHA-256: 85a09949a4bbf9d6150a8586b34d007f4b3d5054e0f82889610598c716ba2bf8
font_02_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10268 bytes
SHA-256: a7524b0a12082fd204d43bbf6ea442223c817197e1f2c8ad50908f7478d61271

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