Malicious PDF — malware analysis report

Static analysis result for SHA-256 428015d4ddfb1b2a…

MALICIOUS

PDF

160.6 KB Created: 2021-07-03 15:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 874b32d831a55c5390c367565ab8f80e SHA-1: 02df517a88b4d3846c96b6a82362326544e78880 SHA-256: 428015d4ddfb1b2a3899df078ca2945fbcb1e9258b7a54bda8d8f78d3c26d972
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

Heuristics 7

  • 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.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=it+and+ites+industry+class+9 PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90822ca3a---jelodisejogematozime.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dc7965e53---rowowibegonekuwumip.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/acb6df2f51c7be0aff34714c99f51aea/33641981281.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c248bf9bead---farunav.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4fa3bacb33b9ec172c9999d902dca53b/jizuxupowekeru.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/zogizowexoxeroxuk.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c68c6c2dd---71134988625.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/38705252459.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4f458540---72472472980.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b3edcbfd0fb2aa030d26b1b5cc6d85de/magefuvagozebusuwunupaza.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/66253538483.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e0f8ed8660c9e641783c7e512227d62d/fadilisusemixutufupixo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adf04638f2c---wekenegufo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7479d429fcdbe70a2d3c732c7168090/55793119845.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/54206784231.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/92269649657.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/6289953264.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/rakimuluvil.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/wigoladijimenogade.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/33217801637.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53bf017a8---vijomez.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/6gv38m6hi3vp4onfjr2n4rk62i/porinesewizemagidudeka.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbae77a95---robegokumirobisuwonupajox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE1D 19940 bytes
SHA-256: 73f39fe421409fc3b4ff64e59a1280086f83ffaaa9511094d734ba22afa7b024
font_01_sfnt_off000231c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231C3 4988 bytes
SHA-256: c10132bcdae09f7cdd01f813f9c299b8eab6c027bc8ad899946adff415455c57
font_02_sfnt_off000243a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00025bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BBC 10576 bytes
SHA-256: 24f6009f98f7b9576de1374cd4cbf8cff2ef0a8f1ee17eae90335b2fd31437d2

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