Malicious PDF — malware analysis report

Static analysis result for SHA-256 51380cb9882f0b61…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 09:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d133f2e2ccbaf7c77a08fc366707983f SHA-1: b87199d79f3881d2637ddb2aa472b3c2db6e26f9 SHA-256: 51380cb9882f0b61f6ec3c26936315875ba8c613b8b7a5cd8bb842c729bc2e80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=emulatori+android+per+windows+7 PDF link annotation
    • http://makinsushi.com/uploads/files/peliwudegixe.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/42482106760.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133ede28ad2f---wekizakonetegutupotik.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/78286972602.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140354958809---73611804525.pdfIn PDF document text
    • https://majubesar.net/contents/files/nesosuravadavabigef.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/57654282131.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191656372611.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4e8e875b---97025989088.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/70640529406.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/26087340838.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/16702702170.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/31563597662.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8f4f574c5b0721d258cf5f587ba0369f/kewisubo.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/zupukopofejojozonizizip.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/65836d501670a848ac2e5edd6fe46c0d/49351301634.pdfIn PDF document text
    • http://carbontuning.ru/file/nenip.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/rutitazabudurupipizer.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/somadoxokukisidakudex.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/fajisigodox.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/14285258007.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gafafakuwepubomavijevef.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/41937562250.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/ponabase.pdfIn PDF document text
    • http://gyliver.ru/files/files/73996401493.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 18392 bytes
SHA-256: c1dc83b2539a91d403c7c2eb7fe545e42efb70b582a31a2fd6a364220e90dae7
font_02_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 10772 bytes
SHA-256: 4ab5002c921b82697da0063239310001aaf21bb20b77414a11909c189fbb0b8f

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