Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36c31af244072e1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 03:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e23e291036f64ad7d002eb1969a11758 SHA-1: 7da28ff85941d02d374e68159df5142d99011fe6 SHA-256: b36c31af244072e15309ad5a9c77176e4fea6ccff4dc7cd0c80effc977097bd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple domains, some of which are compromised or appear to be disposable hosting. The presence of external URIs and a 'download button' heuristic suggests a lure to download further malicious content. No scripts were extracted, but the overall structure indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dhf-china.com/d/files/sofilovibasopipemamitipim.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/12585198125.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/sijorabipemajeferu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b2hqmrrmh86h8rg7b94l87dli2/fedifelejanadun.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109120321199976.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/19961682201.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/kipezatejupudafogiri.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/fanusuxokarob.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/pazevefiwabaxedapolatepi.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/93003258502.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/82437125239.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a5fe713e---taxigirimewiduri.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/fevenuwolezupomopubolodif.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/gimunesefufovife.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/67116015b3fc6cf196dda157613bb452/42293441640.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/buzapot.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/63359454359.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/vebonafunudutux.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/ravekukofogibaw.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/45752065977.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/beveseponemove.pdfIn PDF document text
    • https://produse-zilan.ro/files/70288509864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=avengers+infinity+war+123mkvPDF 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_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 18408 bytes
SHA-256: a7503d96451e014b88481358cc265b413b0876fe0543431ec8bc89e5d57e85e3
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 11076 bytes
SHA-256: 8b14faa321cb5d281e493314a81c9401d7215bfe90ecc17a1c4a57f7c8fb93bd

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