Malicious PDF — malware analysis report

Static analysis result for SHA-256 445a11cae3b04288…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 18:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9df10bc14bc090b4e9064dad897a65be SHA-1: 5868690844136588b96d55944e91c6c9a2f38584 SHA-256: 445a11cae3b042884a1f8aa25cacbf34481afcba34a060248ff874b9d4745b53
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is largely unreadable binary data, offering no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://calienglish.com/ckfinder/images_store/files/zenewepevikaxopoxi.pdf In PDF document text
    • http://landpas.pl/upload/file/53031368097.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902143253329805g9j7xwe67y1h.pdfIn PDF document text
    • http://penetrat.ru/files/files/54837052042.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tamifaledefuduzof.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/52555699523.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tiritalikebinogofetunolab.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/98364367882.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d314ec1f---36974800508.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6bf466ca---jefadisor.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dkrcfljl9ba093bob0nasd8sll/julozixemowewofe.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/jujofevuxiko.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/bozanowetumunegakux.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/050dc9ced68da534e03ca4e054efd9de/53685421249.pdfIn PDF document text
    • https://angkagenap.com/contents/files/30283830899.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210907_203228.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdb1359b9---nobiwizowigunuz.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/23439638490.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/691469247.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/jajetor.pdfIn PDF document text
    • http://fruitvita.com/files/files/3634383299.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bfc1b258---33609830842.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/63632384002.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210904123508.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/gugalamugeberun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+speed+up+internet+on+android+phonePDF 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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 17620 bytes
SHA-256: 780d8a5cf6cb677dd43252242526c512d0c7f45ae1b4ce6f802ca98da055d609
font_02_sfnt_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 10620 bytes
SHA-256: e4954449d0011852644385f998cff17391a65c7b48dbcce6e63b7b37fcd15728