Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea06ed3e18982df1…

MALICIOUS

PDF

106.9 KB Created: 2021-07-09 09:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c60eb6a5c97755c332a9db0be85ad897 SHA-1: 7ccc9c4361c4cf98aa1742c1ea086405e72920a4 SHA-256: ea06ed3e18982df1cb84cafbb668fb23552322601d421e45602df1016d673fcc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous heuristic firings related to external URL links, including those pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious content or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • 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://smidgel.ru/uplcv?utm_term=unblocked+games+333+at+school PDF link annotation
    • http://sunnysolutions.it/uploads/assets/file/1150619395.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/79517152048.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mng400kunds3q04bo8o8r82mla/71262280490.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3201b364---kuromatavaj.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/bfd5b9320e42ab3baad7f85318680cf6/talan.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/lefenaxebolinabelete.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d1312340---46176928061.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/67177618688.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fe582f35e3148ab6a3f27f6109f8d884/jatudut.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/21f1e642d5b6062527738d646607d094/44920825113.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3a111558bca634be4fc82fe96f3175d7/woperolukovewemexilosuz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fc60982cb---rokapupuxidirifavigoku.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/96o45nejr4ig32b0g2bmmfvuad/97573127384.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/19355158618.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/sufodotupigez.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/petuxopubusanome.pdfIn PDF document text
    • http://altinay-law.com/images/file/lenologowijosetap.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/devutudamiwexegatofe.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/29369199531.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ceb3c8c0d97e26d58dae0eaca723e96e/sewuxadopawimofaletejin.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58f90229e44db2d4bb4a64a543c64c78/40563533090.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 7232 bytes
SHA-256: 938d1c61809b361d64cdbb3f1ffe9d33ad9123955ee6604a3857d9fec0c7d9e3
font_01_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 11036 bytes
SHA-256: 8f43bb1aa8a7f6808acea6d9d9845e3af429df8a6b02443cbdc86a0b90ee24c9
font_03_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off00016b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B79 19504 bytes
SHA-256: 09870ea14ca24facbf27bc3c2c8ff45f7e7fa5d88cdbcb48e021a1225fc010e4

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