Malicious PDF — malware analysis report

Static analysis result for SHA-256 52439e0b9d9b94a2…

MALICIOUS

PDF

120.6 KB Created: 2021-07-26 20:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a7bdf8d2f989bba4eaa1ed1c650d908 SHA-1: 0fcd9b4f084c11a754152399ef2e33667404e66d SHA-256: 52439e0b9d9b94a2e14ba7743a51f5581d8b7bacbcc2886814704e331b1d02d9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains an embedded JavaScript stream and is identified as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/734b0c529e0074cc8b9f41d8dc22a298/49264298374.pdf In PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/napetif.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/acqbesmqrln1jkv26mnn4ua1r3/74773526499.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae30664aa---84860813155.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3f139b35---kujakaxobumugagitukera.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f178e7c3e53---6453341754.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/52413179899.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/eaa647dd6ccab7385120926b5ee7ea8a/gifedipogi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a01106a28f0733e2d5fec0c4b686117a/ludobitir.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/93489101546.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/71228682637.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1cp6e6p8vp04nioabl8o2uqp4/pefedonabolevolimaf.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/rinanepus.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5a367ff2f41fdfbb1459f432541be23e/3435564243.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085527796d2b---36591074375.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb7a63ba3---tulavu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/22510114290.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91479080532.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/36379290577.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6t2sv8g9ilik526hfq63vv02o3/53886696177.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/jakitavagotono.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/95506135359.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/galubi.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/74391099069.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086826c1e555---60203679488.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b9d2bf93d---20187431126.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/burakasosivibufep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+seagull+chekhov+charactersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C66 10536 bytes
SHA-256: da87abc4600f4f69f41f9cb2a54912bce775c56cf1622cdeb8dc7f07294954ee
font_01_sfnt_off000174ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AC 16176 bytes
SHA-256: bf07699e75eb6bc7266f9094867aeaf8ff89114a3ccf22ee6ea519659404633d
font_02_sfnt_off00018a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A256 19512 bytes
SHA-256: a4a1ad2df818e1109c7583759798b238dc740dd6b4c4dd26364c2a9e2b59c7c4