Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7e34057336752a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 21:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f2f6433bacec7c8a4e2a760e2700cf5 SHA-1: 4ac41abf0b2d56851bb7a61256256ac87e84b37d SHA-256: 9a7e34057336752a9d4b3613fe08c4a758869ba54dd463184f810c9b51df9e6d
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of link farms used for SEO poisoning or phishing. The presence of a 'link farm' heuristic and the compromised CMS upload link further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/novetimujefujezasife.pdf In PDF document text
    • http://misr-consult.com/userfiles/file/13980658055.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/32764896079.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/vuvutivaxiladadejunajanis.pdfIn PDF document text
    • http://rapet.hu/files/kozonupap.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b30b14021c---fukutoluxipefovasob.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/5819632570.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/33f532aca7a4f113e399e662bfdcce49/tebiviw.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/mexinapulawosumu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8f8d2a0cf85f88260c76a3cdb3b8b0cf/zekiretuzumuwuf.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/nivolavajuv.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/505570653.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/476ae18dbb8bf2054a15c026ee063221/menasujatigupoton.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/bekamape.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/kefipebiji.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/dunenujudepavilirukabeki.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/rutugiwufek.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/xuxalisegodebin.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/82259848984.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/2489619046149640bbe6f7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wiggles+app+for+androidPDF 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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 10568 bytes
SHA-256: 4778a99655884d9d9ba9670ad0a19997cb93950071d26da92693bf420d8f7412
font_02_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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