Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a19a06fbd18a1a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 19:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec4fdba74ec43b8bb0e43fe4423fbaa8 SHA-1: 511938b8da1a182f5d3f809c751b2ce4209cdfee SHA-256: 59a19a06fbd18a1a5e7f131688b64c9c92df7eab5cf2894b422e8e21c230dbf1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of multiple external URIs and link farms suggests an attempt to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=pioneer+wma+mp3+mosfet+50wx4+manual PDF link annotation
    • http://hyundainhapkhau.net/upload/files/78768123089.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/09ae441f8924a4b77996b36d994874e2/41429124012.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e8a6eced---mupudip.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceedaa35e---89130458289.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160874b15bf7ee---zapomomaxil.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/kubepat.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab2658ed9---xenemebelivemomadalevuduf.pdfIn PDF document text
    • http://webbuilders.com/files/file/jekepejipobupene.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108bba689bcb---7177089974.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/dalesepowuzozat.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e26e3bc6d8c---54711821795.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/xolifurivel.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sigabemedumekido.pdfIn PDF document text
    • http://schokozentrale.de/idata/fapupejolur.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/3621382422.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/65621156811.pdfIn PDF document text
    • https://studiorampinelli.com/file/kenerowolepininorusa.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/791a2247d55404aae2fc9a1ac82299f1/jajuwuribarejurisu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/85688061993.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/78450206667.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/d40a8mtgvmvjjv6lsi57al3fui/55794594532.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/ginabivajibifikebotezepin.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/evms4bjqrni43r3r77eo17dear/98676026784.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 18352 bytes
SHA-256: c98e21cbb1c2e2773eb76f5f2ca7590e6de83156847bb57ebd192cd1f0e72384
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 11316 bytes
SHA-256: 538aaace890b84f1d6109685d6ca9d347d25d5e4eb590fdd9209b92365525ee9
font_02_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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