Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f43f6d55d4ccdc…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 06:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23e51c69451fdf5d0879b107d31baeb2 SHA-1: 2dbba28a773584c13f7ab136bfcb66890f177959 SHA-256: 05f43f6d55d4ccdc40b84497376339b6c13daef15fdb744fbd107a153dfbf85b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=latarjet+tomo+2+pdf PDF link annotation
    • http://s-pack.kr/userfiles/file/20210908031148.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/dafonutepusuluv.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/setezazan.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/82014104554.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/70324360031.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/vumunumoz.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zelusomupadadeduvojef.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2cee00ab---kutavavulisu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b48acb3c---65866184226.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131d647a0bd8---bivutudazelidiv.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/18374656288.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/sitosuxil.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/komevasinewomuveku.pdfIn PDF document text
    • http://usmleworkout.com/files/file/sigamovizo.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/sitonumisimobufajeba.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/davirabiwepoduwoxiko.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/makanojebaterejova.pdfIn PDF document text
    • https://digireg.at/upload/karunaloxopolunameb.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/53126584163.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tepusunoruni.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/26877891307.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/96081668547.pdfIn PDF document text
    • https://datajournonepal.org/files/gozotomaja.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6jvij79s6bdl1s450c4klgmi2/bakulimetu.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/jofakavumamugotoveferolo.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_off0000b404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 10456 bytes
SHA-256: 0312c5edfc7e77cdaf258f4aa7bce99e9a06f746b880c945b971da0afa31f16f
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 15600 bytes
SHA-256: 8e93003c7e71ad92e81741b5e0d5b827e76340a51545c490ac701488e8617b8b

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