Malicious PDF — malware analysis report

Static analysis result for SHA-256 949d2e4569c4bbf1…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 08:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5eb35c17f5dbfd470b30dc1e48fd3e1a SHA-1: bc9ca2dc30d404993854edb247ac66e25827444e SHA-256: 949d2e4569c4bbf12ebb7966be3e8add98a3bfbafd154cc42795c0343953feb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://ohadalegistrocbarter.com/ckeditor/uploads/files/wobojidadu.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/61bbe0b6f114412d24233f3919e9d4aa/bedenorizewuguwu.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/72309084440.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/36884295574.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/091906387391.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gobukurino.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/23851089288.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/dewivimosivugabubopuxopa.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/d1u07honk96jrb4gnvhqcktka3/71439531895.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/rupezufumuwata.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306ea79bd37---90875731761.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/noxomaka.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210912004507.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/wopavifolinabunomoxaduvam.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7f2c306b---56762206573.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413973f1d83---14943846752.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/sozositiperer.pdfIn PDF document text
    • https://aashianarealty.com/file/wesuxedesogagonax.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a7504b66---44956319027.pdfIn PDF document text
    • http://asqcert.net/files/files/kaniduvawib.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/20202612437.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/67053096146.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/pamazuvovuzowimel.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907103451.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/30498142630.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/muzixubobesujuzibowilulek.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jrauu0nq889me2cf1v2cbdj3b/29579090282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=super+mario+gba+rom+downloadPDF 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_off0000cb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB90 10868 bytes
SHA-256: 811aad3e52f83ba25691effe9d2ca9960bd7be4f4f7c79a90b5c72465a466faf
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 17028 bytes
SHA-256: 11c6f7d1c78d144832fb4f481dd8b79848eff5f18cd11c6b26caf69eedd8dbf6
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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