Malicious PDF — malware analysis report

Static analysis result for SHA-256 654017d4f0681091…

MALICIOUS

PDF

86.9 KB Created: 2021-08-06 08:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d7314b5815b9e559bab0e8c9158b475 SHA-1: ae68cf3009d17a92dafe1eb61b84ebadf00bfb74 SHA-256: 654017d4f0681091ff76c002763e2b7b8722e4f4ffd42e765b2cec6fe0c295ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous URLs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://laborke.ru/uplcv?utm_term=nursing+2019+drug+handbook+apa+citation PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085239066e2d---18012192664.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/vezewomilulopu.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jewoninonupixeromu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160714235bba48---gavabatofawupadovumevap.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/86063740662.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/51596941947.pdfIn PDF document text
    • https://anjingliar.com/contents//files/40694607311.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ab4990ee1---rusiwurukotafujoxiv.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348bc3783c---nazajagudadixetukaw.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/nokedaligoxiki.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2f64dc078ef2d2ab3ee487927f29cea1/50885572552.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/nejanerefo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fcdc2866e---tunaruvekesipu.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/fumojuwalazobadepi.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/71889881882.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21ba17893c0d4397fb36f49dbcb3ef69/wibasixano.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/julireni.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/turirebamodakanotosu.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/zeromamalu.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/24213042571.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/pilavofoginen.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/zimajivalefig.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/fobite.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/biruzerasilesuw.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/91296356450.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 18316 bytes
SHA-256: fc8b40de8bf700d2dbd9e55e10cfec2b80a2f516b0df72081805be94d9f4b4ca
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 11388 bytes
SHA-256: 70885da18b75b2e48ec3bfb531b30a2f4a01ba033f1938d57100cc663f208db2

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