Malicious PDF — malware analysis report

Static analysis result for SHA-256 8137349bbefae064…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 09:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ec48f738e46298b1e2775064a127d0e SHA-1: f6d0f083e0116d26ec8d9c5ac0df1f369aaa098d SHA-256: 8137349bbefae06468b9bff40622db7423b4871d92c6b1918dc02b9968fa8a7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://palami.by/images/file/fibalexudotudogolemenowo.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/17950977114.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118f14e27634---lumefovokitowof.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2ce6551630ea5da2f593701a880b86ce/3691631333.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/31/file/61735264225.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3828fdfd1e---25061791883.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pebuxirudumebuguwiwanaxub.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/75737700135.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/nisozimara.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/96464805860.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mriu9v3pkpnm0gapl1ef807h06/jalufuviwujopo.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/94346268171.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d96b6b067fec14de921e2fba391f9197/vowawiwukamifinazekozaw.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9d839a5816f099875216c77094ed8de1/bajuwa.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/23283500235.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zasavuxadurawap.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/muranejisexoman.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/mizorizituso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a507643e---48284908291.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9db706fbd---sazozagelos.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/43597266828.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/wafipoxalipov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=phonogram+sounds+pdfPDF 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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 17576 bytes
SHA-256: cd682bff3ada2680ab5a94123951bc634fac73f564f33f114859ad432e54cb09
font_01_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10676 bytes
SHA-256: c8599d32d806239281666f99b87f12e8a1f7b7ceb784a5c8d750e70dff877d00

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