Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe0832bf507032e…

MALICIOUS

PDF

79.6 KB Created: 2021-08-29 23:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0410e44322e17929b5493a38facca0a1 SHA-1: ab5be491a1fbccb0e6d7e7a258a17a9c0fb46162 SHA-256: 8fe0832bf507032e5141adf2e107c32851ade0596d78b8ee1eb1cfa6f358a9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and utilize 'utm_term' parameters suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://wastran.ru/uplcv?utm_term=free+robux+giveaway PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iufkcao8a99rjpafnhk9mhis0i/zatasexuvili.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/39697913876.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/nkmnqlloiult6ll09s86l1mte1/raximavudedivigi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce22419af4---xidiponazoku.pdfIn PDF document text
    • http://quranday.org/userfiles/file/91639368462.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/uoghuheppvf5m353723dj4r5ge/24721975596.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/nupafogez.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/okljbtjdqlasv9c2eota35fj6u/44494559266.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gne3n3luhfk8qfb8fd6r09n8j6/sezofazojoboji.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/59654181281.pdfIn PDF document text
    • https://mahae.hu/files/files/gabipizo.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2107221313442377019727m.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d826196b1---wiwasofufumabudepumininif.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/tobefenokesenowor.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c17eccd7---90106069624.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/78050331862.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/66442423427.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4f37f91f4baec6e462d32191e2da3e2a/98238494574.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7q4k2egr2vosm94os8s92cbnm/29732446323.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/nefoduk.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/birewadisolobujokata.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/07r2q5umurg481obtn676c8ldb/76869828802.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_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 17932 bytes
SHA-256: be10f86ff3be03cf77ceaaa0ce421871a097fcb459cc03542649b6924850f5de
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10452 bytes
SHA-256: c93595424e159ce79ebe554e1f9f90a27f50917b8c1b10a93d0ccf8a3ab9d003
font_02_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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