Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f6d43df6f1841…

MALICIOUS

PDF

84.8 KB Created: 2021-10-17 10:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a1e617779e12575fd6fb5b8c22807418 SHA-1: cc1ebea378e47de0f6391c46bb7c97ffa4465682 SHA-256: 0f4f6d43df6f18417532461e5029c538d45e4d8361a6a87983c166d6ce41bded
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/21064319225.pdf In PDF document text
    • http://yuanjiangchem.com/upload/files/xokixixafiwaw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ov74e23eg3shf1a1qt7rvl9j5/xaleduduro.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c3f28e1e1d9a9542fa01d1585c8d5e3c/kaposodokedusap.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c5f2c9d18---tozesekijefamuwujosonepoz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b81e93f052---28106310942.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/sifujaranonodo.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/sekotusisuleda.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/93302446871.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444f9a41512---96920436407.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/mivajapis.pdfIn PDF document text
    • http://novafish.it/userfiles/files/tasipoxifuxasa.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xosigimotigukomipefogaj.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/21447133169.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210914155136.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/71376279495.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/18260444960.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/puwakizadigubimopo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/zajobuvabogujopakufumiv.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/ponuturuvisevep.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20211011020531165.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xesadujimogiwaxufemu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bf9tjba1km3nmtc56uj5qe0l54/51563958044.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/puvejivinil.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/36961701361.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/javer.pdfIn PDF document text
    • http://tzsunup.com/upload/32713682548.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=characteristics+of+neolithic+periodPDF 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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 17484 bytes
SHA-256: 9d895a025bc70cb4a03a011027f3864506b0bcd5a8f3f9d35d91b11f27738ff3
font_01_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5A 10748 bytes
SHA-256: c629acf4b662239ea9072360b04c520887ea50cbd5d78a54a108941207a2e25d

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