Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7461950b1fae77…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 10:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7d42e2b641b905ce0afb7a944260cfca SHA-1: 36b5dd60fc3385574cd355dd448253146ab28dc3 SHA-256: 2a7461950b1fae773ff91259bd3f1cf31613c8b4750e9c3a0d1f50a3771b50b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS uploads. The 'Password-protected archive handoff' heuristic suggests a tactic to bypass security scanning by encrypting a payload, which is then likely delivered via one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cissud.com/uploads/ck_editor/files/bowuletoxomofetapat.pdf In PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/29751082800.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2c2dd20faece0284cc5cdff5c51e5df8/jonepibadujuvunev.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a4d58859---jusavolidavaletosap.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/mitatibikadifegifafal.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bbedde6ae45---notavesujarodefol.pdfIn PDF document text
    • http://szpk.hu/_user/file/gilamevetabetivujozow.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a48aa316a6b---96988313620.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6daed2296---wakotawilaxixesez.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/31038828245.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc55dc8d58---4631497820.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l3lh14bg4d45no7ju215tpvre3/sajidaranozavipozafo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bovujixanikuguwoxebeziki.pdfIn PDF document text
    • https://lecapsuledigian.it/file/dexonojaw.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/betemoboxidukul.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/jp9vdlmcs1jslnivsbeu9655ul/nisipukit.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/2061958357.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/27453290257.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/degivojowutupekusuzanujil.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/jugadevuse.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b3070f41d75---dunedidosuxutabus.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dofac21s57ou2mquc5a88mes9r/vugaxag.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2ea4c4cb578de0b3d1adc5c38670ede5/ribetijuluvapowok.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4640268d2efba64fd249e19c2cc1b03a/17145327867.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7b203f63---labogulibojiduzevuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=medal+of+honor+allied+assault+spearhead+torrentPDF 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_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 18744 bytes
SHA-256: 4705edde82b48007cd828d48902435e52574a0ed47825d73c1f7ae4494130fbe
font_01_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14754 10688 bytes
SHA-256: 89623a36029cffc15117ad0250cbd3f3fa2d3220320f897c94acb98c461f05e8

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