Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fbfdb767a793d0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 11:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f93be62b17f35f3bf0058cbb59f36c14 SHA-1: 77241bd23ebd8644dca4ad5509dbe44cc084720c SHA-256: b4fbfdb767a793d03d72e99b0ae2a2df31773f62e4f630652a1bd7a669d108f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf974e1218---58752038645.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fff7b821c5cc7282765b9e37cffe8328/79762537748.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/wejivivi.pdfIn PDF document text
    • https://podimercrm.com/img/files/letinolewivebulupu.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/8593165939.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53ff3aefb5---88921665806.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/5g2aqt2g6m52fqembu731p73ca/gefagebizadisobuko.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5b8535d0---kidajunulumavubelukuma.pdfIn PDF document text
    • https://pmms-online.com/assets/file/79276720917.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef215d276---suwudavije.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fa18bbadafbe9743bd6af99250014ce5/xerokinepezugisoko.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gagazawalube.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/10298691399.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/63dda6a657fd16b48069ee30852195d2/1258535752.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/rununenulududobo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4n08a15vls566q5c086dbvv20k/71286179551.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/nijekofosakuw.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/30518165541.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/25659358065.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xugati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=formato+de+acta+constitutiva+de+una+empresa+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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 10880 bytes
SHA-256: d8be678ee809184be06546c53545babdd7ca73186aacc095932a83babf7f83c8
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 19764 bytes
SHA-256: b78284c9694ee817497231b4f199086447eb7a7ece5585403c1c5dfe484a960e
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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