Malicious PDF — malware analysis report

Static analysis result for SHA-256 6903be3327bc3aa7…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 07:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e150ef3c88bda82f853031d2037ec3e SHA-1: 8fc84e4c0b5f54eb638a0c0b833c7a21e7ea4c31 SHA-256: 6903be3327bc3aa7e20488b70df4444304efb78a0a51db6828ea8d89057a08c1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/737d00a4f2e3899fb0b53e1caed86db0/vajeweg.pdf In PDF document text
    • https://cakesandcupcakes.net/userfiles/files/50250611569.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964ef21d970---57417900879.pdfIn PDF document text
    • http://18554080.com/userfiles/file/newibuvatavawezes.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc5dd5f331aacd77a7d1d781180a6e84/39516055280.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/kosubalubizoluf.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/eg5vmoun9b9cl8gdaqvlnkot62/65015442009.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nkpahicnc8m4al5vqangsga5c5/zulebome.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088293c0246f---81696671739.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210610005512.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10946c305---79694008743.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082c682ef677---56433893918.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/mezedofotazi.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/88669861091.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xolaworu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0qmbiifed9iavdr0lacmor14lh/6514410262.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0193c3fc0---mixugukufiwafi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f61e5646---tufifawu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aff363d16---85622286113.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c323583890d---49956446395.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/roxelizasiba.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8df12f042---pezulopemejajakoron.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/t28m3r28070ebd7d92u88a3d1f/89306705604.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b837137a6a2---xexeziwadusavaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ph+of+a+buffer+solution+formulaPDF 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_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 17036 bytes
SHA-256: 729391051bbb2aa35201be2d9cf4e5ced78993f620bf4e7470ec27887918c069
font_02_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 10720 bytes
SHA-256: 82fca371839a6a68268b2c93c7d10e3712f33ee7f6e5abdc90e504deb4c2b3ad

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