Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d6d063d5483be5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 10:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 134df9dd43c53983e5f5e4a8ea515f7a SHA-1: 222d087a10f96cb742ae97ab6a43c54f10fd8dc6 SHA-256: 33d6d063d5483be51e3f483f9d18974bb52debfa67fcc336315f8d48b7dc7ac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/dcf15f317e4763de0ccf7dd6eef8aa5f/vulafegarodivorelodidu.pdf In PDF document text
    • http://foodchemsino.com/d/files/vitojiriburiwenoxemiref.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/40972304345.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7366bf5a7a5b5663cb3806edbb924aba/90275054002.pdfIn PDF document text
    • https://flomogroup.com/upload/files/82158832751.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1a0c43b1---lumeziw.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/93370519045.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/fasedatukekudimowagona.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/81589649353.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n6uqfp2r5kuk4offstofe6p724/malexokaromunu.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/91837399446.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/28182382796.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/tozixulowibi.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/74689943932.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611345dd36648---pidumofugejeme.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/17586784604.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ralabepofejilidur.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/lofipexasegoviborigaf.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/93f1h0ctgbab10r9fdsejte142/duvinurilikinitimepi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/14458656771.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ocdhmaoqalm0c77hfev0i5qntk/3381376593.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/vaguvoxifikesitej.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914dc9c5aa4---93164384604.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/69553516161.pdfIn PDF document text
    • https://promise-land.com/upload/file/51924140873.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dda1b164726659d996e8cadd90e2d662/belix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=end+of+internship+letter+from+employerPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 10696 bytes
SHA-256: 1c2afd19ffca063f7d3bb0fa5ac417cd52e43615d872403cf204e97ad694ec8b
font_02_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 15956 bytes
SHA-256: e23dc73218e620340dbf4d72d718ad7aa5b2ebce8daa4634416f40c8088995ef

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