Malicious PDF — malware analysis report

Static analysis result for SHA-256 341af87901abac2f…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 18:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c98374ab3dfe7c6edc14418ddce520be SHA-1: c9e4cf36f5c5b2ac7ce55b27e2b1f13d14c6d5da SHA-256: 341af87901abac2f2fbd27e41f2365011f6a9e1339cc9614619602e3e0592057
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, forming a link farm likely intended to redirect users to malicious or phishing content. The presence of these links and the detection as a phishing trojan strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1645d4e1ea16e8c19de8b1fb90850ac5/3065638693.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f9788798---21698569424.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lulibenimovutinapekasuxu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a4e441eaa3f61c9a57b4fbe13d414052/nafapagiwevalivevimuze.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/v4fu3dn2pt5f3suqpr2k4ms9h6/7653775360.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zozaxunasesogor.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/20819677305.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/17636120931.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/679ad401e74935e0f88ba54f0bf31419/zizovebirofupa.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/26795b0853eb152eb4ac51a8fc4ddc0d/46174044422.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b2to5d8arpbe3653ie96gguvc8/ravijonuxugavuberizavuj.pdfIn PDF document text
    • https://papiratisk.cz/soubory/xufesegebaronugabelu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5a351fd0c673e7c25bc3821d4cac8edf/43243498330.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/loxisuxipewexuxatexawavip.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/89028101409.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a5fdd99b9f1cdeb6f8eb11dadbe78e54/mineditelajij.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2cf5c1a70---xedotoditidasevatelos.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c811229a7d---jekevizufajafap.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/wofatopikalamotubivuwaba.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/68753723646.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/pimesolulutodimejap.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/a3cn6pno22ej9s91i3pgegpk1i/jowizusener.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d276e4a31560dcc43bf955a612578a33/43457135448.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd75076ad---48614029839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mason+2+radial+head+fracturePDF 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_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10788 bytes
SHA-256: 723ea29f1cdedb2905971c2e37479327d0ec4734bd3da695853fd14ab360d638
font_01_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 17980 bytes
SHA-256: e32501d00548e867682a7d9ca6b22e6e6dcdf32934a020fb591ff9537990edce