Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1076cf1707056b8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 18:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2491ead707b4164d77de3b641065f0e1 SHA-1: 4d90a48859e505d2b6d56ab2fecc857953cb6311 SHA-256: b1076cf1707056b89d40eff3560e36b5520d4a54febdc88bc8e1e4e46de82402
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vico-immobilien.com/ckfinder/userfiles/files/vugubulibufelelakabetojak.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2822fbe140d498e7984832015ce36d69/ponoxepuwojawanodub.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/bujokigevuz.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/xaderonefaxoki.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f6587b179634971abfa292f9ae40b59f/51851153229.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c308107a23---tifuk.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333812940ea---41043814037.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8506646801.pdfIn PDF document text
    • http://hiniceshine.com/upload/fuxixiw.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/nigawudipuxoxapodeb.pdfIn PDF document text
    • http://kme-kme.cz/files/file/xopugewika.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7e783874---69881840341.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/81842298282.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/desudagotaju.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sevasir.pdfIn PDF document text
    • http://davcpundri.com/css/file/kinivonasupamas.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gusax.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5df33b58---73515629031.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/vepebazidosabinurul.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jijaxoji.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/subawisitefuz.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/6942104347.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7657d4a272468d5c59b4c941d58b7aff/8425063092.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/wurofusadonekiwurax.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/fanowudumari.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/dutaviferir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=biochemistry+dm+vasudevan+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 11172 bytes
SHA-256: 64ce9e082ac230e2c17643fb5c681ed92ed2019f449dad7adb5d5c40ee33db7e
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 16676 bytes
SHA-256: 31232da8f48db19800fb61fd352bedefc505be116d28c853468e4b09ec432c48
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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