Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f9db6df2cf336b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-10 07:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 912f264543d6cddbc500a9e4a15ee365 SHA-1: 88b3e1e8c286e1d23a8a5106052d11c0e9add9c9 SHA-256: 90f9db6df2cf336b4e8f5de83559284059377c665511e14d7192919bd89ca455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, 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 via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://bogelaipigeon.com/upload/file/4229689719.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6d183115---jopesonuzu.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/98058056838.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4909ad88---60615054820.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d40dfb20---2467492043.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/fibubevogusaparixutabal.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/sobabavodarurudeseruxofik.pdfIn PDF document text
    • http://bptramptour.pl/files/file/66608063567.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6932845ff3b23c7392ac41c8e83e76bc/baxuvumajirazirokor.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kjokk8pqloq84ec6r6qcn0bqev/disonizejulujoki.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753fa4af60---golom.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/dusazisitefoxokif.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f6486517c---furovilerajuwuri.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097388e9c5---18453281101.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mamigofiginixas.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098467b7c64c---kuxifeteti.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/5385981990.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/25214931422.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/vakobuzotanime.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/85610477416.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/nerevomiwijaxato.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/875kljrsg44tt2gegubvop9dfr/dofowopudosikuximuwaxep.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/medufa.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/44624883659.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c365c6b8ee---17341577209.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6c6a29550---12975026461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lower+back+pain+after+eating+spicy+foodPDF link annotation
    • 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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16224 bytes
SHA-256: a1581dcad9b283a9c7c5d1036455a60da6e98b0ded382cb4ca678b8000553d74
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 11140 bytes
SHA-256: c5040da862b1d4320ceb3b01b53c70a52752bbea858432562a95bcf619b8ad3f
font_02_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1