Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c632f47b4ff0b6…

MALICIOUS

PDF

76.6 KB Created: 2021-06-30 22:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57679d8416a5715c21d13f9ccf58cf19 SHA-1: 2db97d0cd681745e9679e41ccc0f28beb3016ff9 SHA-256: c6c632f47b4ff0b62285bdeeb1ca86f341ba4fc5c00e87d20f681734ac78f100
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised upload storage for hosting content, a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://alexlunacoach.com/img/editor/file/burufus.pdf In PDF document text
    • https://amatnieks.lv/pictures/image/21038397347.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/ruxekumagegaxutori.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d4682913f0---fulazevanojajipusos.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/tekeduresisurudobo.pdfIn PDF document text
    • http://kfbi.ru/content/file/zadugefitilipejebasovat.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/gefotogupiwuxorevaz.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/morebejaparukupu.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/pudaterupufuf.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5e7b74da---52254101649.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qht98ig9if58uedt650oanhq51/34133924057.pdfIn PDF document text
    • https://tappowine.com/file/belaloxuligesovezaxinowu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609511b6d9290---33534816696.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/8c3qqp7ds1i51fcmknd54fi8tb/sazajeluxoxag.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2b68a4d2f99846529323217150c27cb6/volavadabe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/65983536412.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/fevimawukasapobilawoxun.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wirojorezepo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f2b7d7721627e512e52a10ae0f1afa3b/vipewabogegipija.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210610161642.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/83a7cc9eeb013961d1a455ca5ce06a67/vokafumugakutugixowiku.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85209f92---dopugol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dr+syed+mohsinPDF 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_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 16832 bytes
SHA-256: 697abccb4505a47f83f933ee5d3bedfcbf808cf610ad240ed77697857583430e
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10320 bytes
SHA-256: 88f6dfaac2a7f8e823a7f1dbabc31092fd82ea83555e6218439b04bd5f803140
font_02_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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