Malicious PDF — malware analysis report

Static analysis result for SHA-256 c961c38f0439c5de…

MALICIOUS

PDF

92.1 KB Created: 2021-08-21 14:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04faf9e894ab215d2d5fa19d0d0a718e SHA-1: 7fdee756ab30ddbfc918417fcf6a3a46df80a4c0 SHA-256: c961c38f0439c5de696615326c513c1f4ac95f4e3415fcca005516f1a2659fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=temas+biblicos+para+ni%C3%B1os+cristianos+evangelicos+gratis PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/sobobevazadiwogomagonisik.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/sekidogolomoxadijube.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/vajemivuna.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jc6l3mm8cltspn2nllv87tklt3/lesapomesatifimoxaduwijeb.pdfIn PDF document text
    • http://industrialdevices.in/uploads/wijexajeleloze.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zegefuwog.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/boj0csiuldm1447o2u5dqauvg7/puluripigelisefalodalo.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/11612756289.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jarazobezefiwaxodeba.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/17384642111.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tuzuzibugi.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/64915278866.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/gisaxusofironekutejil.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/73421050691.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/82619308655.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d2d0c726---99016466255.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zekadawa.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/8008832295.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae163165ce---gevozob.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c5043b6a815---5973988898.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d4f2cf78042b484c6dfe1e438588ff13/42433031822.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee2e3fda2---potojumud.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/radozokamofoxi.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/retigukagoropozepo.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_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 19760 bytes
SHA-256: 7094a1cbe70cc098d52cce046c3affd1a8c4af6d2d36c50d2c2d289cf75e0a9e
font_02_sfnt_off00014658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14658 11092 bytes
SHA-256: 5df3f3a36ce283cafc2a4456272543bad37ff33bf85bfbc23171c189005104d2

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