Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa33e7f780ffd6e4…

MALICIOUS

PDF

92.4 KB Created: 2021-06-27 12:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c50f4cb528b10f08b6a09ba312beda08 SHA-1: 629463787ad3639fb4f42ce97e45aa2b2b6451d9 SHA-256: fa33e7f780ffd6e468cb004d79e9d7f3410ed04b1a5a1f7a6163e65b9e1bb4ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://smidgel.ru/uplcv?utm_term=nonforfeiture+option+in+life+insurance PDF link annotation
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f6dcc3ab---vetiredisenigafujaj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764152adb5a---82878705738.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e621a006---70989490104.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79f399bb1---begafud.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/rarepaxajes.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608260c61ec16---zisox.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/98374374297.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/bn73sunil5sbh9846fmh9acore/51372699060.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ada5fe3b521183164dccaf41d6e791eb/lukunanatovozuligivolexud.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e896e13a---sijuxirusabukorido.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zosinekemu.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/webivosador.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/wepekajufomugufas.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/gudipepidaxikopaza.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1cdc986accea70bf95b50701b8965351/62540368735.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc488952b---rikiwotozerurim.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/86928044916.pdfIn PDF document text
    • https://limmaginebistrot.com/file/kopilej.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab566871ff---rewawuga.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c706e51da3---jaxupozo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41df35af1---20516174489.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3cb19930---16017564954.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd21e6f5a---33559140823.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2359f0ba6b0ecc219d907cd5c70baa00/lofunizuxabubupudotamipax.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2f728d5090f2ccf594223bfac22634ae/bivozukuvimisel.pdfIn PDF document text
    • http://abc-tel.ru/data/File/54027533676.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/norifunukipubodetigow.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_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10552 bytes
SHA-256: 6dfc508dee4543f6d832a0b3c7a5788af2c8af164f48cbfbb99d6597a14de5a3
font_01_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 18632 bytes
SHA-256: 14a1cc1a1dcfb13608c421214c69650d90745fc985ce6adedb27eadaebbce545