Malicious PDF — malware analysis report

Static analysis result for SHA-256 603e03be871c6722…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 07:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8de294b92ec42de2a9b74060ea6f4c05 SHA-1: 01954045c70615647ddc197660709e6eef1d3e1a SHA-256: 603e03be871c6722507ee11eca9e069d9b26927f99ded9d7f2abcdb0c89a5920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, along with the ML_NYX_PDF_MALICIOUS heuristic, strongly indicate this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=presumed+innocent+scott+turow+pdf+download PDF link annotation
    • https://dacinsara.ro/fckfiles/file/53634720769.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4961e9b3cc---jupebolaf.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c966a03619a0c08d7adb64a3adfa882f/41672368972.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/bezuwopidanurixorisevuw.pdfIn PDF document text
    • https://airshow-bg.com/file/bipotujudowome.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8925f082---47123675946.pdfIn PDF document text
    • http://m2m2design.com/userfiles/tawiripuzuvuwepebaraz.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zawokitejomabe.pdfIn PDF document text
    • https://curvy.tw/upload/files/sirevugamuvekitojimamaru.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/72655765094.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde20b88ae---11019141324.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c54633d4bd7---nenedovoteva.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/13050301210.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/4670694834.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/4394176902.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/67912169350.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/p2sbni0refbi0fvvom64gjjsr7/sowazinewatanatoxeditibu.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/rowevetamanuvesepemu.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/63062882862.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a738dba79df89c6147f5bada49290169/35586082880.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/ziwewafutudiwikekorid.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/40016959916.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113b3175c927---mijat.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pm0lct510tjtc32m6b5dkroru0/jopamidaba.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c668de7a6cb---mibobodapotep.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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 10968 bytes
SHA-256: 0904e73bd2fb2ab34cb603ab59269aa08f1546d2fe17eb1f77e5bbe8aa15f5d7
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 17892 bytes
SHA-256: a8dc3e2d61cd16e481da9a994e3f3fb24d3020c425d98bb686dafe53d1936b62

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