Malicious PDF — malware analysis report

Static analysis result for SHA-256 677307a70e65a68d…

MALICIOUS

PDF

100.2 KB Created: 2021-08-16 03:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26a7a1e7a1dbc47e728c9a472c6ee062 SHA-1: 8042e0aec90827e8b53c2af4cd8a0dabf7cf2eb5 SHA-256: 677307a70e65a68d082e0d1cc9267e10808cda9811aba87dc996f0015071f418
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites. These links likely serve as a link farm to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/646fa28825ec9c729375983551099048/dabebidulebibejada.pdf In PDF document text
    • https://inverpalmas.com/aym_image/files/kakozoxazupamemowuka.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20c05821d8b006ec2993f6e54dbc80b1/86210193104.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/tuh47girqjdk36hm0or8etucsc/29706497551.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076334758918---tutemibedemakire.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/ranowosajomi.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/volonit.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/89409394296.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/zomomovejise.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///lokopexanimofes.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xaledinuz.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/50085411779.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4d4d0dc9---16127025709.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fisonuxoxeme.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/negasuxanaxomow.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/47128185379.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/lekosavulixijisoxusak.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/sapabolekogogokozanuzo.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/7719c60476118608783c3dac0639b8ca/86652607856.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/63d0e3676dcd9101787c15b0121ec9f3/sazagabobulabipexi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/43841386387.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/10412462225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ashab+e+kahf+in+urdu+full+moviePDF link annotation
    • 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_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 20408 bytes
SHA-256: 296917dc7e6d0adf76e735730e9dd94b9340d60009a9d687fe2951249bd42788
font_01_sfnt_off000137c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD6 17100 bytes
SHA-256: c49fbbfdf2d66f30952491d4763bbb239413b83cebb50bed427fdf8d508ae9ce
font_03_sfnt_off00016932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16932 10900 bytes
SHA-256: ec4d19f7b0b2a8dcf1f8ef3f04530dc4422673ecdbc1a7968b0723f59838b18d

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