Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7345b11e23f7e4…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 05:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d2a90992801ed54ce8a5e48481ab1029 SHA-1: 668093628c381aae35f73fa568b0f2f168d3f8d7 SHA-256: 5b7345b11e23f7e4f31d4419e3214c2fe0bc3ea17dd741e7b5cc31cde2bccf33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest the document's content is designed to trick users into clicking these links, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=house+construction+agreement+format PDF link annotation
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/92248b24c882dffbb07b38581a3479cd/nozagabefobixebu.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ab152e0ccb4d02f7a38002a3150fe210/wugugakewirax.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b385a1b3e---zusepixetofigojipe.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/59148510606.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f34648455---97215481448.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/263883788.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/kaxugotulizesuloluwag.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/mutigovisoxorilim.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aeac30282f0ce95499cd69e39a21d5d3/xikilevukulazerutelanojo.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210525145822.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/840237bb5510e009f914ac36e4df63c2/pibugilajinage.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/a78la0u8fuac4i0jkmh0601jde/34551790978.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xafit.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/60780919613.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/rukadirabakowixozozixus.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1d5bcbd0ba54217b1308eb100f2258fe/30597151383.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/204f21e14900ac582fb4b32f126e5fbe/lofezaziriredevoxubosopis.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3fdd255c---36203766755.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/99d0367d58fa01d8ed4127b1942c0c13/fufotaposivodaruwibup.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sufuba.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e1e847utmglel5hsceg2538vnq/najepolinajovexasomodu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/g151k3iv5ehrvps1tcq8d2qq5d/diduduni.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/87108987548.pdfIn PDF document text
    • http://technische-dokumentation-hoffmann.com/upload/files/dogesokudepubivemolejulez.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1bb9110495a70a72ed30772cd01b899e/20915511970.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_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 17432 bytes
SHA-256: 6aa10856cf34aaf492ea09620d765f1bc2aa7868cba9e3e947c5347f74cbf660
font_02_sfnt_off000141d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D5 10724 bytes
SHA-256: 70aeed3ab680254187918af08c2027f8226f6b4800e52668bdfd4e566831dab2

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