Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc9aa6f8d652b01…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 10:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a1b926e872ceea5ebd51011021451c9 SHA-1: dd51d113bee94153ec983dd476b85cb3deb39882 SHA-256: 6bc9aa6f8d652b01d4d37dc3b2cb2a69a9fb8d2cd24812e333a054bbfb0cd597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. 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 these links indicates an attempt to lure users into potentially harmful websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=factory+reset+without+password+android PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d924af6c---36140021127.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/16576485017.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/gijixafusipami.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/11926877256.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xonanafo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bigamokokuronijow.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/turovorotojepamuxuro.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nogedefowadak.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/94305925036.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zowejujunato.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3cc3b14d851bd51ebc552c804e7b1341/33746199803.pdfIn PDF document text
    • https://vientangluc.com/upload/files/1026806581.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/69753965625.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/zibanolidi.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/dusopodesit.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ferafopoz.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/xumosidosaz.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/ritepelozilez.pdfIn PDF document text
    • http://trubaopt.ru/content/file/11857728662.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/wudelawuxomaxaxo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/lolotav.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139156867380---xevexigezejufuvitidoli.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/33437388420.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sudadafalagonixo.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 17968 bytes
SHA-256: 621ed519cc0b7d254dd6ee27768fc84796564e1e6778ea239a76ca2bdc6688db
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10844 bytes
SHA-256: 6d8ec0808b703e10288b8e76a242c8ffa46276272874ac82686511247aed5afc

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