Malicious PDF — malware analysis report

Static analysis result for SHA-256 35918b10cc7efa47…

MALICIOUS

PDF

81.3 KB Created: 2021-08-27 08:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a244006a649a5f21476d34a6628696f SHA-1: 7f55f789a300ce1d57400ea81bba02f5ab5d9ad1 SHA-256: 35918b10cc7efa472176dfbb27d581f5e5cdf340933f2519fa5ce36ac8258c0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=harry+potter+and+the+deathly+hallows+symbol PDF link annotation
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/9829645849.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084802f7779b---71260328391.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2e7f1a4a34db8507e17a23aae238fab4/54272505509.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/58354391488.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9a4d6fa2---famedofib.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/46539546098.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/32386739691.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/79281854453.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/jivajug.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/81414834428.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/19873918906.pdfIn PDF document text
    • http://paliukenas.lt/i/File/44691068441.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/47463243979.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/mazubanidoze.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c25e695b923fd794334f894e41eb6fdf/90428419962.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/fofapazuv.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e295fa38---dukoxuzirakabojitepuxebaj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffe4bf307---kafidasakejipopido.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/mivekogejofowoveropobilaf.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/60608716805.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/vomusikivonebufi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/4agr1uke0j1ur0vsbskv0ocj5g/56283260034.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/49051298730.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/lezer.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77b58660c---73020609054.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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16700 bytes
SHA-256: 02fd9a00a4d2bb063a8e3d3133b99f7b02e936d8bc3e4c0256a552c14bc3925d
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10896 bytes
SHA-256: f45788c12a09a8fa6f06d42da5445225bbf1923d778be4fb70abdd181a977aa0
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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