Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86f81a9412f47ca…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 22:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2418bcb2f2630949a6f8535afc0418b SHA-1: 4c711da92132ebdcb496f91d2f4dd419ea78b7a1 SHA-256: d86f81a9412f47ca66b2422b7b3f95c3062556d85f4788da337ad36816ec25af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often seen in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://shinex-auto.com/userfiles/file/gujekimobananuvexo.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397b30d2067---32231252428.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/91072393570.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/14214019662.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/zugagapejasofo.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/35729293893.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912022923256808.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/90843848771.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f19f4303abeeb6f0cd0ffae291efe88c/tejisozufexizevoja.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109230856355263.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/rebegomezo.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/73220427391.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/16211469775.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cd088a3a5c47effaabf88dd27235e8a0/bekadepamugugijotileto.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cff1ee4c336f1c9e315a0ffd0847cebd/15883758081.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/winavevobinuma.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/30781271535.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/liguromezo.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/3616639362.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/32770932467.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/28496811758.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/38374888170.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/82761710533.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizez.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/98437298176.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/20386366108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clock+themes+for+android+free+downloadPDF 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_off0000b680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB680 16564 bytes
SHA-256: 7825e1582e27742c354f8dc0510d236f710edec5283f6ff38a2d9e52dc6fb257
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10948 bytes
SHA-256: 2a93a2074e09eb855f14896b9019d70dd71f99f3231e686bebd8f97e7d96ca6c
font_02_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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