Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f722105945b82…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 03:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ea6efa2dc60bfb83bfc10c95fad3753 SHA-1: 60e2e047be8cf9f2099ab7e95b5fdbeb8dfe483a SHA-256: f24f722105945b825e14418dcc0ae0e1dc1a7f08c5ec12807b041aa376468527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zdravka.hlpr.hr/userfiles/file/buxoxowabiwatowovosi.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614908d30e56b---75665869236.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/zedizezuworixoka.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9iudg9g5mironulaf9c907v3v0/balatofen.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/37eac29e520cbc55d88ce28feec6fccf/99549069500.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbeg8s2go970jv3ikfut7gi3j0/75531147699.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/32767039582.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613560b2e7a0b---30631805998.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/27748538567.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/66706790854.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/73204942771.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630874874.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/zilanukawekubenuziguwov.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sakonomabodasezudu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6c49abdd9330ec203f7aff0128161f23/50169333593.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/fowomixalepagesabetukul.pdfIn PDF document text
    • https://salonorchidea.com/userfiles/file/poxif.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nubupadagotozunuluxobawuv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9hgau66omcjskodl4r0rrvtfm3/sebotigurarodefowav.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/99416945573.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/weziperad.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/97552202292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=most+populous+country+in+the+world+2020PDF 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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16556 bytes
SHA-256: 1b9c38f216097dd97862c0016a2c461254a8697573284c4e0f46ae85ef154053
font_02_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10984 bytes
SHA-256: 5c17e2ff0cd19e9a99d01b0b0db27a3d366a304936c5adacddd0ed8127c205bc

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