Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb0e999311ebd6f…

MALICIOUS

PDF

79.4 KB Created: 2021-07-29 18:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84e590dfb717b97e3e26c782df52c16d SHA-1: c320df0da770458e12e2ce84375bd6e0dafee242 SHA-256: 1fb0e999311ebd6fbc6a4fe6ebfad3e084cb912bf2b35b75734daafcae302baf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an intent to redirect users to malicious sites for phishing or malware delivery. The presence of many distinct hosts and the use of UTM parameters in some URLs further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/407ace0626abb521519b8684c3f140b3/38375031811.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5d1b03e381d79f7fa7d615d26114f79e/zulurevamelajisobiraxeme.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/vigatokefu.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/momasogorajigo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad22a979b72279cce9df649d82dfe5c6/5935079467.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/93432864992.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/66ac7593b310b8a57a67e4a0697e3e02/28248556338.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mujeropugubo.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/59644489859.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/j7erjfisj3r07hafck4h30l204/96487349063.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2203c79cf---nojovigebe.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fbe9d949---nalazuzuxafaji.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/99071725478.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4be953cb38c53f8e8ce2d8e3d6b68b0b/20619308521.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/piditoz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2a507cc22c678a706f7c40f705585b7d/13603334505.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o6i1e1m7mj40rtrg1907211gm3/zazukarada.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/62e2d7cb86156a4d73a2cbb96d315e34/vefojugewavabekelulebepig.pdfIn PDF document text
    • https://hostingpazari.com/calisma2/files/uploads/xosufakomasujuxarijupe.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/12582182606.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/fusibonezunuvukiwir.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/sisewukitawoka.pdfIn PDF document text
    • https://btegypt.com/file/terufok.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/duxulofuxuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=baixar+musica+do+youtube+para+celularPDF 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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 11080 bytes
SHA-256: 9b925dae8089218ea5c73297682125c0c6b6764ce23eb8dd8a4a8f00f055ff0d
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 17640 bytes
SHA-256: 65f2b46f6770656321d081ab9abeb8f927bcf70e7bfc421fd0f946139c71f053
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1