Malicious PDF — malware analysis report

Static analysis result for SHA-256 6781fde56b1b5b90…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 16:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24cdf04dd00aa2a1e02593fd36fbdd03 SHA-1: 336744da671238cf672e0709554b86455f8c2300 SHA-256: 6781fde56b1b5b9050af06e1af11937f47352c8f4b5849888362e84afd75b862
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=audre+lorde+if+you+come+softly PDF link annotation
    • http://fornacedelia.it/userfiles/files/15104294490.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/xusikobavifiteremekobida.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b606f9918d---zevuwudejum.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/96424763052.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3da20c3d38c9ff1c1405b4910ff917f4/14070804593.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/28666003323.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/livanori.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083282776fb7---28028445896.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844dc68def---wezefuwiditunixadoj.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/17265866937.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b21485b7122---kitufotawofibuzadareviben.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2469d5be3c3a062796670bba3b018eb4/lakuxafisugebu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/311407504497.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/sewogasoxufoxovabe.pdfIn PDF document text
    • https://agatanorek.com/files/file/rajopadokile.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947206ab4e3---dikutasuxudofelozedi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/20be2be55f19adb5138fabf47cea9585/mujeseleximepibadopuwi.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/94185614623.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa02b783633---faviboxagawetilowere.pdfIn PDF document text
    • http://elskenecologie.nl/files/29797359868.pdfIn PDF document text
    • https://steammining.com/userfiles/file/rorifosogatax.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b25ed647ba1---3709360218.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/rifunowetafax.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wugeg.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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 10568 bytes
SHA-256: 360b36960cba6e6c13139479754bf1fd87dc36f5a9f4b10fcdbb146a4ac8994b
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 16984 bytes
SHA-256: 089f682f7832f0ea94f911d30c0eb49ef2ae36725ae6a227b1cc99fbc2bd1b8a

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