Malicious PDF — malware analysis report

Static analysis result for SHA-256 3704a4a8a0a0eda6…

MALICIOUS

PDF

94.5 KB Created: 2021-09-14 11:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec619ae51056b5ea7abb3ae738c671be SHA-1: 0afa9e005083170d19bb5c93b840f753b0c34258 SHA-256: 3704a4a8a0a0eda6a1bcccce10d2d5f6ecb07943756eba01152a72bfcd4b2cca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to redirect users to malicious sites or for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially serving as a secondary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://artpolyclinic.com/file/files/guwubavenudovovi.pdf In PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/kipewolomuzovofer.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/79473030878.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lelubaweto.pdfIn PDF document text
    • https://rajaunited.com/contents/files/gisada.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/57830346870.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/18412537233.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/29769804467.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/44496921649.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/36573264195.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/20926150247.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/minotojez.pdfIn PDF document text
    • http://snsi.jp/image/news_file/gibunazesukuroluzefedu.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/gebidagomimivusarig.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/besigaseromipuxabaji.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/darozodibiras.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/30889200510.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/gokeniw.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/wudolazukupipezapuwotek.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4cdf22f83---44869122601.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/suravarusovukizudulukarip.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140257b88238---zigaxevumoxigavadikijibe.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/60224661514.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7fa4b537---turuwinamatenidone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fortnite+skins+season+5+chapter+2PDF 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_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 10748 bytes
SHA-256: 35772637a462c607ea4662442bd042fdf507b2aa6ca551ca640444e26f435309
font_02_sfnt_off00013fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC9 17308 bytes
SHA-256: 2991e9e49223d27810a69aa0a512dfeef8accd45f366d0f0c0be7d108b5900b4

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