Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e5f21d897d6679…

MALICIOUS

PDF

82.5 KB Created: 2021-08-23 13:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec7ead7e57f74a7db7e400d4be3774d8 SHA-1: cacd2bfeac1e561c06318f5a1966f5be797bcc3e SHA-256: a3e5f21d897d6679718e942217b63399cea78cfbe6581d83f1ef67a677cef620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://csodamalom.hu/files/files/70950065993.pdf In PDF document text
    • http://servmed.net/userfiles/file/14228747982.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qumlvvg9flh2f3emkah6vmn8m7/turudefaxi.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/37474440662.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrheqsg3j5b64je6c2cu93l889/63663437465.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/644128eea47cc6281745541a86297f80/vesawopivanijalazu.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210604191827.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210617202115_l58llo.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/sagifej.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2g2qrhf2ennims5k7hcf87mdi3/jonoxavines.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2384633b---58876902601.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/22400077646.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/22392512348.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607242ee0a9b3---duvalimaseremuwusage.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/ninojituzisagonakokosaj.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/79541370946.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f4c8d0064eaaeaa12793f645a7407a47/fojakawerejere.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/43000087361.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sinopanigerufesasi.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/fofajafebofaxufajikij.pdfIn PDF document text
    • http://tfforming.ru/d/files/63471520086.pdfIn PDF document text
    • https://questyme.com/userfiles/file/4668462981.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jejazebotelepejuxuxul.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/ragugizubuzojevimuzopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=allergy+and+rhinologyPDF 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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 10356 bytes
SHA-256: a439ac23a5ad33060f704b767595dace9fcfb1a77898db0a3a2747688dc0b450
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16576 bytes
SHA-256: 01dadddbed2dfac20941e62214e2c450d7b648cbff020dc1bf733292eb3f89f6
font_02_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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