Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60d4d71449ef32e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-19 04:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d4ea67730a9ee4a8eb14da60c13cc30 SHA-1: 01a3f9b80c93f85870ed6108cd1a837ba37cd330 SHA-256: d60d4d71449ef32e51c6bd7488ee9460deb63fcbb799c5993118a32d87b637f3
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 phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm used for distributing malicious content. The presence of a UTM term redirector further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2226cd08d---9307916287.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358be1a01b8---dovujugeferozupu.pdfIn PDF document text
    • https://temahr.hr/files/86650040391.pdfIn PDF document text
    • https://iword.de/userfiles/file/dizanosimuvisu.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/bawimitusen.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevaseludadikutenowuxi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908034734.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161468930a2fe8---pumakow.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/pozigobefegazojixisuzoj.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/73436776773.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zixewa.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d7ea780e---zasixesakobozagujen.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e27a3d38016f9abd8d56d8c30bfca28/nadibis.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/rowavawukorilagogipada.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/40435702401.pdfIn PDF document text
    • http://unityproductions.com/upload/files/najesogusufobigubukuximem.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/rezazukelo.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/99739033546.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/70214050727.pdfIn PDF document text
    • http://bdsductri.com/upload/files/pojoxavajo.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/zaboni.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/nerumoze.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wulofumedavobe.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/nawuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=run+3+hacked+unblocked+games+66PDF 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_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 19412 bytes
SHA-256: 926b30b9cac71607b77b5e35dc280a715c44b4ce6fcbaf345605f6280922c3f5
font_01_sfnt_off00012d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 11244 bytes
SHA-256: 56d332e3fe4cd458be3b78b209afa12a4215429f3a89201d8dfad90a506ba903

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