Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a675ab8a7807a0…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 13:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 958acf7b4b416fbdf4e084bd7e1b8fbc SHA-1: bfc24a4647772c669c9fc1dc415ca57553a9432b SHA-256: 63a675ab8a7807a0d254d1306e06e8f036bbdef66b65ccc17cda9c8ae0a055a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV and an ML classifier also flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The primary function appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://rilta.net/userfiles/files/53604495669.pdf In PDF document text
    • https://cemb.ca/upload/editor/file/sagukanizejezorijadivibes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105a54e83b---65780280339.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/golojafupanivededobede.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/85429495948.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/beliwobavurenopirunumupu.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/75429422328.pdfIn PDF document text
    • http://vlajamo.cz/images/file/radojupidevemilopepo.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/vuzamijijujepafogazinet.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/munisuwixidisofajowakaki.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/begimewawuru.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b44130104---mimibezijaredi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7f733a32daa811caf3247ef4ba84d3ae/24759010970.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/17591755473.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/61659407466.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/zarud.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/budavapulapusenosofoli.pdfIn PDF document text
    • http://slovoveri.org/userfiles/ralegukorudogojafaj.pdfIn PDF document text
    • http://trieuduong.com/images/Download/remeziwowanovoku.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/64244647477.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/kodibamufeganaxowojejeku.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/18959182154.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133336d0484a---bipimitolotenivipapaxis.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/28061186626.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c4afc93eef210dddf32e9c102194e977/63954339388.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/sobatefaru.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/liradefogibaxe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3a460ddb731c017e9869b159eb600357/26210080537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=indian+channel+apkPDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 16924 bytes
SHA-256: b0305c35298749641f700f45c62a9959bdd0d1766438c37965494b70ebf15d94
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 10168 bytes
SHA-256: fc026b74888b8b9a76019057272f107ed660de336e20dbba8f0090700f710c14
font_02_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1