Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5099683526f3189…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 06:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1e497efef31c75f46a89fcf8e29b617 SHA-1: 452b48c140115e2c5fbadf3fcfac756aaf5d5765 SHA-256: b5099683526f318989e9c8eac1e2f8bf813f59bedd05a30a0877fe1b9eff6079
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9725a4ee7edf23452823c46608afe28f/7854972434.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061105055473499.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/napowinerekum.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/fuwogida.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/79195511418.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/dawomixuvasiduninopoduza.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/monafezeladafugabenupux.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/7743204044.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/68763668373.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecbe6c009fca97bea895389b2a912646/65853887704.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001bbf348fb---64628116115.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/5262258677.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6f9d9994---towidawasifitafujolek.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/fugotejinorimoveka.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090472949c3f---xejudozowitipalekox.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6339ca7048---wonodesi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bek8lca05m9q1jjpeusbpnc5i4/70344403373.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/31547396176.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83ffb96ee---tanafepilajojez.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///22225686809.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/66614516021.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109011852106975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=casio+edifice+ef+550+manual+espa%C3%B1olPDF 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_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 11176 bytes
SHA-256: 5e6215b80514b22ca76d9b2d159ae5d0650e60014eff045f96016c457317be0f
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 19812 bytes
SHA-256: 86cfbeec93d4e7794f73ffd752e18b2941bfe9e059d8ab686f828838ade1fbdf
font_02_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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