Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a82f01e53c2d34…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 17:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e25ec2331f1e80c99ad7c4f360a29292 SHA-1: c484cdbe9ca073cb0166ef103f283fcbcb37661f SHA-256: d4a82f01e53c2d3431b756defa808d2555b55a29c147fdfde50ffd076af9fcba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms on disposable or compromised hosting indicates an effort to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zuche0551.com/upload/file/60894928166.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161416f6fd3c4c---liwokeliru.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/76773264662.pdf
    • http://jinyezi.cn/upload/degegevokata.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9f3af65b---tepivuva.pdf
    • http://immobilier-valence-agen.com/userfiles/file/jezebigulisis.pdf
    • https://marblo.ph/app/webroot/img/files/gulot.pdf
    • http://transportdiverse.com/uploads/files/99700096545.pdf
    • http://rambud.pl/uploaded/file/vegizotiziga.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/dosoziwapipetutemerobe.pdf
    • http://poaglasses.com/uploads/files/202109160009441573.pdf
    • http://cn-polylysine.com/d/files/66796916780.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f24af0de67850157339843c1e0789ea4/70462851616.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/devotuwatakuvobejebaru.pdf
    • http://neteyes.eu/editor_up/rokivufejejutiletubudu.pdf
    • https://www.gurgy.net/ckfinder/userfiles/files/80468763541.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/67564791607.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0ce2d6b150f53c8244a60b820cd420c9/1455712185.pdf
    • http://machinegroup.ru/img/outer/files/75363380203.pdf
    • http://tianlanip.com/filespath/files/20210917190102.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+turbo+vpn+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 16792 bytes
font_01_sfnt_off0000cf5c.bin
5fd73794cad5090ca59d4cc10b7acbf3589fba193a65db16d0dc9e9d69b38e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 10480 bytes
font_02_sfnt_off0000e713.bin
fc3f703c83b09b270cb12ac9beed532f66419dd85ad6d7545b0b9065e4993d23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 16400 bytes

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