Malicious PDF — malware analysis report

Static analysis result for SHA-256 60372687f3071c0d…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 13:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 905f33633f08db75db15e0687077ccb0 SHA-1: 9dbe163d50c2976faaa4d8fe1de5fa4c08747229 SHA-256: 60372687f3071c0d180e76b901296ca91ac759e1df6e5e79775b95ca2647dae6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bae6e62ac---pozivuzutu.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39617c33b---pupagupa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pozegarot.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b32d88af0469b3569ae51c05d13820/didinatigelobofudorisaze.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/70454343296.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/563ce2e8f059ed424c120572a467edfc/82567455440.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/36c6e0fe0bd5e6e6200ca7274731c4d2/bubunaf.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/4l4o12cknlti21f0retbk23tep/xigemenuvivofi.pdfIn PDF document text
    • https://aspirans.com/files/file/50333595631.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c2063aa2---jalixiniwukejowevozazo.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/89007751435.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/27796148682.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e7a2a35e8---32977680081.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e35639c3---gixetezomiv.pdfIn PDF document text
    • https://daismene.it/file/66576469335.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/sabemogute.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9103034d4f---vefofetaputefedosekawi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07c23aefe5---jifaveg.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/46599366190.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3390c3a6c91c52dc33db95c0c7d89c78/kakenapoku.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/71577474752.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd1dae127---77105966326.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/43a073f70f43995acd3534b4debc39fc/77288878118.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620759880.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/96379816265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=words+to+make+her+smilePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0cc39bf7---tuxojukutafafadikufi.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_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 17172 bytes
SHA-256: 64d98d249105f126985e499037a51880e0edf66a0b975aa540f69ec373fc0334
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 10492 bytes
SHA-256: 3be15390791432cceb9a86b74715e06e77d9b34aeb02fede7834438053f23ef6

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