Malicious PDF — malware analysis report

Static analysis result for SHA-256 a801034fd200f0f4…

MALICIOUS

PDF

83.4 KB Created: 2021-07-28 05:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8565f1cf567525c018540672de3f3314 SHA-1: 37d8aa1443c569f684b2ba357001830448ac6f60 SHA-256: a801034fd200f0f4275185882aaba746a5007073395036d2b790f7f649def805
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using link farms to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rana-international.com/userfiles/files/74045392042.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/suriwirozodedafisekuxe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe229cd495---83387070967.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/pejopobexuxusuberabipa.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/59862919148.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/20145993377.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/32646784902.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/vudotugogelalugap.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/170544296310.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xejubujemilozezuxim.pdfIn PDF document text
    • http://www.siposferenc.hu/html/9167348285.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/zotokawokumuz.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36342746d0---89198875912.pdfIn PDF document text
    • https://negaratoto.com/contents//files/64926878200.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fb0020b865d1d62b4f378fc96db0235a/geparobad.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3091ea1ba9f1d4c9067513638030359f/15344520530.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/85c8f2e1ed0dfef0a512640360cb4590/konelo.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/4003178407.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/41573310144.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/bulufoxeta.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/subugofu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d280ce0286---vokivibumavibazamime.pdfIn PDF document text
    • https://fallsplat.se/file/83041557111.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/39886481756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=student+exploration+dna+analysis+worksheet+answersPDF 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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 11060 bytes
SHA-256: 55dff95257a721bb2ec8cd2444869e5dd84bf3d845b2c5242fbb6b05ca46fc55
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16900 bytes
SHA-256: 1d8ad3b5579611191b735ebaad934be062ec99bef14e73bcda361273f9fb1c04
font_02_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1