Malicious PDF — malware analysis report

Static analysis result for SHA-256 4217695691c4edc3…

MALICIOUS

PDF

98.6 KB Created: 2021-08-14 21:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f64476efa952f083f07c7ee6a7496e34 SHA-1: ccfc2ce2c228b745c91585ccf289df1d0917ca32 SHA-256: 4217695691c4edc391568b0b16ba731ab28954df3edbdd1fc4e08dda980946f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure, likely attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://synerhu.ru/uplcv?utm_term=descargar+la+biblia+reina+valera+1960+en+audio+gratis PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160baafc7375f1---40243336595.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/25337390340.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gabazalevaperexinis.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/94b3269b1a7eb4b0b39a97cf094c5ec6/18862402725.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d182552f0a7---63691184373.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/87314997675.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d9493bef959cd90e3123ec1977454b17/wudogufaroga.pdfIn PDF document text
    • http://plncse.hu/php_data/file/25959324064.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9c2c58e87821a7f8198b50697137e5cc/29149297024.pdfIn PDF document text
    • https://isosklo.cz/uploads/sesakumumifajasiwijoriko.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/00670f2a185ec5bd2d7b2765ce26a48a/72957570702.pdfIn PDF document text
    • https://p87.hu/files/xugebawokabegu.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/jaguloxa.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/dawoxejomi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3c37d916394523a8fd39deba710d761/surebufurexu.pdfIn PDF document text
    • http://mmcaana.com/clients/29274/File/67486607563.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/24062386918.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/alum6k440qu97jci9nqhel2lae/tokub.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/94647941315.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e772b21061---42955239709.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da0525f86---74109435945.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/degixaloz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6235338f37---54561015815.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/98430bdd73d66d0355aa5db166c543aa/24541395551.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 11364 bytes
SHA-256: 17bbda24fa0b6408bd403053439822c696fc520ec8ec8935533e763fc0954bb6
font_01_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 18208 bytes
SHA-256: ec95fee90f8ee7ec4092812a387c440f178d25473422350693167f9a9725be90
font_02_sfnt_off00014a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16258 16396 bytes
SHA-256: afd58a155aeefb3cf33ba496fe3bddbe9604a1531006b68d08fcfe9d7dad1741

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