Malicious PDF — malware analysis report

Static analysis result for SHA-256 f729a5f955b010a5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 01:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2c3a9bf40ec71b47c8faf266bdf6359 SHA-1: 4d0e8cc14a945cb3ad258fe7a2df50bac0c73d29 SHA-256: f729a5f955b010a5e9be1e8eb6e9592381a8d49c637bf6bd9797cb414e86e3d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=vowel+sounds+in+english+worksheets PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/aa9ddbdb4c447997c083109810a3f6e8/ligibuniginirekakilekakis.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b630cae919d---37867810109.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e0jcatr9k1fi43q4tu5m5m66va/fanubexalidobenaxoj.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/pubanimamuvenupev.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/8657177683.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/86161173630.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5e4618ed2a597ecf019c13d09e5fd6ee/61517656819.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/suxit.pdfIn PDF document text
    • https://songhong.info/userfiles/file/livisenob.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080435bae441---paladufirovunarapev.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160864f89af792---18968310303.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7a673be28e57e6da8dd7e90228f3049c/5295613149.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/62896549030.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/42609397943.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/nabenidivuni.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ua2j6vhl8nsd7ts7ko04ikl7e3/66033371831.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bc1c803a5f9b8a182de89b6fcb66bf18/92628507481.pdfIn PDF document text
    • https://pratham.one/file/91600039479.pdfIn PDF document text
    • http://isgsrl.it/images/file/gisafudebul.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2599d4974713d039963751bc37a62935/35448475014.pdfIn PDF document text
    • https://yasacompany.com/upload/files/52752051769.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wizoroduvu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/91723045329.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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 17324 bytes
SHA-256: 2a4f6af69b60a6a3fff799aae21552d3b865a5ef3b37c5cff806b78de0abcc13
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 10612 bytes
SHA-256: cc2d3942238851511be62c0ab5a483509f0d437673fdc3588c88c4292fad2a88
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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