Malicious PDF — malware analysis report

Static analysis result for SHA-256 9504807bba57dca0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-13 04:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b093c20b9457eca60ce9650a0240317d SHA-1: b8d3c3525e2223d0c361ef7ea25df349e887b5bf SHA-256: 9504807bba57dca07a3ff5444905bb2893ad647230d7785985cd46c33996571a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=zenfone+8+pro+price+in+pakistan PDF link annotation
    • http://www.anjhimayath.com/upload/file/jamujujoji.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/gavirofurefopizinugo.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/lakovizaduvujajesorib.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78398d104---tojares.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/43209300798.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161315433dc420---17124915453.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/47557828900.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130e02126953---48528194117.pdfIn PDF document text
    • https://virker-ikke.dk/files/93465642675.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/bifatalivurofelidutinirot.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/zavozaxumonotegesonugi.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/webimad.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/74142649388.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/migekawiz.pdfIn PDF document text
    • http://gnox.vn/upload/files/92171195448.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/61999457087.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/xupezas.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/75047258737.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/muwovobeporuzedujaxug.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/65022756493.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/27370514180.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/24383823768.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f444db737d---14670913866.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/3844856957.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/wuferoge.pdfIn PDF document text
    • 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_off0000b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB178 15496 bytes
SHA-256: 286aa9e3c319fa9d7a42295022eca2bd9bf40b765f59a75064b50eb9d3944583
font_01_sfnt_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 10692 bytes
SHA-256: 502d69c48d7dac0cf99d92940ff859184c8fb4987c4adf231f84ee457d018e43

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