Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc529c0ac1608f7…

MALICIOUS

PDF

113.0 KB Created: 2021-09-06 14:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e18ebee731d45f1d095cb52947a6f37 SHA-1: 7a9f461d0a0903979400a87a563e37a9d2a279b8 SHA-256: 5fc529c0ac1608f7c25518b53e1503f425a9a9d9e24b87bb4afef5a37f6eca0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=cleopatra+of+egypt+from+history+to+myth+pdf PDF link annotation
    • https://ego-sofa.tw/uploads//files/202108130444062226.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/pulobenunezezu.pdfIn PDF document text
    • http://jarosi.hu/files/file/41807325979.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/tufaxulasanoziwen.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/wogiteludazejazepiv.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/98053310243.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0m8oqon2jn509fog41erok9c0/punanuvebogidogolatebewi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/da1678a38962c1153355f996ea862137/21804586471.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fogodig.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/pivibiwusereloxagudaw.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/bilovatajivanirokirujopex.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d035fbe3---vukogixulukazuvugal.pdfIn PDF document text
    • http://fotossc.pl/_files/file/laposapa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f970fd2bb3d---silakejisaxirem.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/benuk.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/sibeboj.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc652fbb5---2886672097.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd54d7262---noxupelone.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c6c46e80---jilajug.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2fic8me49v0cp5sp8cbuspq03/vogozejinarerubilov.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/pinikitixifexosep.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/35826637009.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe400e5d8---kimiwedo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4f6a1b95---70997310929.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_off00014e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E57 20720 bytes
SHA-256: 8e0bac10eb9f6fcc721a500971305acbc98f5a0a5464ccd38a76fd47500df0fe
font_01_sfnt_off0001846a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1846A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C81 10988 bytes
SHA-256: 0f85c9f3687901402cb0b02d8fa2692d5d44967e2161994f1c59f2ae3af8fd47

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