Malicious PDF — malware analysis report

Static analysis result for SHA-256 5030ca388df2d7e7…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 00:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c7e42172639a9d9c64ce354d35ab73e SHA-1: b81b96e2b8b327700ff791094731f597b4ddff4a SHA-256: 5030ca388df2d7e7cbc1cb1871ced8f2f0f1c5690c05cce70174485182147936
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous links, many of which point to compromised CMS uploads and disposable hosting. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=analise+de+dados+qualitativos+cole%C3%A7%C3%A3o+pesquisa+qualitativa+pdf PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fc46b93a---94685346318.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/90201508058.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jomekonuba.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/68283927566.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b2762b91---fagexexofumagogow.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/7696260853.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2474a825a06a1aa28bc2d3e5a8fbebfb/firafugojoki.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/157311d45c07205116fdc893d8f2fb1f/runibebesobilexoli.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/funusufokisiwozofimunuvet.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/10254850288.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/xagiralejimijufelisoti.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/merokupi.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/vefivibapudajawevorone.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7f0b642f---44910412851.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bad104d6b---koris.pdfIn PDF document text
    • http://kotolantopeni.cz/file/75631333142.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607701ab2739b---62641657591.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160757a4f9dfba---vodeguv.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/wozapir.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1ok82uv5u29efcqg1abqfleqqg/pewuloxifaradupu.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/28370011026.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s0kllme1mnir6l0afdf9550et6/63326292958.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/81e15dc8d049431ba6abc2eb616f8d2a/90740243999.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/6bb979d58ebbbe261c07cdef3e8826b8/23217496360.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/23472713287.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_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11272 bytes
SHA-256: 7b352324d498c91cbde19e5fda537670caa8e14285c02821754bfb5c2ed48b88
font_01_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 21024 bytes
SHA-256: 3748c40cee1bd3201e3a485d9b23adc957dbb0b70127497847f5170508358dd4
font_02_sfnt_off00014822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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