Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96c64f11a928f58…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 01:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06a78570c6430df2a901cdcdb7d37d86 SHA-1: c6085b7833fb18f1417cad02541f97c2850b609c SHA-256: f96c64f11a928f585d5bbf0c33d6c4a5c7eccdf781c8fbe9dac85d68f204e780
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mrs-edu.com/sribati/editor/uploadfiles/87951701933.pdf In PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/wixifiku.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/gumesubibela.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/zatufizejipuwore.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jusivedosamurigewomazim.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/5895885882.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/lisiwigenifikadoseninipuj.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/72787646551.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094104aa8fc8---78882505034.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4a5e22dd3---misutisu.pdfIn PDF document text
    • http://domplus.su/userfiles/files/99139792156.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161113d9471b33---vafutowowosema.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a72d0cn8nhdn9pathvrjf49nh4/55492553386.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/setoxasitenasorosigurewal.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/24464835168.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/modudufovezudupi.pdfIn PDF document text
    • http://candientushinko.com/images/file/74996454348.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/13326335694.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/riwetulelefifumomazegu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2740df656---11491757893.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/jotet.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/57011759090.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f387648556---17471996258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manhattan+prep+gmat+quant+pdfPDF 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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10760 bytes
SHA-256: 5cb93be65a3cf8dedeeaf729dc3ef6b7ff0b85b239a644db09c5cade493dcce0
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 18848 bytes
SHA-256: af8d621d540e32b9522d95fe71adfb24f08045a899d46b3ebab1602882b3eff6
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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