Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e07bb33ad511d39…

MALICIOUS

PDF

100.7 KB Created: 2021-09-05 03:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d2bf13a306e4c7324487eb2f7d3fa3db SHA-1: 3bbeae59edb6eed04695db165d513eb6ccddbe9d SHA-256: 9e07bb33ad511d39abf3467f636ab68845f05d57d89f15325f0e3e65eef063f1
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b34f1253---gajegopozetitaged.pdf In PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/50568986859.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/tikodarokepejunas.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/tegisolasagenebuf.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jifam.pdfIn PDF document text
    • http://tipiland.net/upload/file/86356083351.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/95656768238.pdfIn PDF document text
    • http://digifast.cz/userfiles/betikunadofujorotavu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790bc64bd90---limajovegizaxika.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210616_091432_6018.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/vozimizoma.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/saramo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bea48559bc49afe18443ef3ccc0dc9f2/35768071257.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/sumufurofikogegavuwikasi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6eaf273d---pekejiwopevamitakimokug.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609729bad8a6c---84526928713.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jenaminipoposubokifepa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160adcfe0c79a0---75239435393.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxixivemurokusureligi.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/48886681063.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607045f79cb0d---93710315598.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4184399d4---xumekuzebigemutakup.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/64109988190.pdfIn PDF document text
    • https://olterus.net/contents//files/mezitixotogaxezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lumin+pdf+data+breachPDF 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_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 20096 bytes
SHA-256: ba9f11eb3ee8176ffddfe51a38627cd3f61eb9f4a0a4437ccc777f4534346019
font_01_sfnt_off000154ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D03 10748 bytes
SHA-256: a7453dbb10964b3d22ff5bafed6711a2221adb72879259c69b9784f914b1037b

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