Malicious PDF — malware analysis report

Static analysis result for SHA-256 225bb98a2d2cffc1…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 06:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73c41a936b749503000715873e97559e SHA-1: ab9c19999ee2f0204dcc819dcbc7e6efdc3af133 SHA-256: 225bb98a2d2cffc152660d8a721b0dedf0ba8fa27b84063f4fc6e75b6ec71de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several of these URLs point to compromised WordPress installations and disposable hosting, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=factors+affecting+reaction+rate+worksheet+answers PDF link annotation
    • https://soechi.id/userfiles/file/kivinunux.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jqpls9mrjp9o1109j61aqv0s6a/14667436587.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074259e63bb2---wanijis.pdfIn PDF document text
    • https://projetovm.com/uploads/files/41025504177.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/sixejedadosorazi.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/91320774952.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/opn89bnrq97fl4a1k4qka6n98e/83559677505.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/kikinituwivejepid.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac308bc79---jiposegigefuliwel.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/23027792943.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/49354634734.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2d104677fa412ea9acd1aa422355f499/84845171788.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/31341427683.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/29433972532.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc956aaa774---jotoxometogipotor.pdfIn PDF document text
    • https://egca.fr/userfiles/file/18334587129.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xevupajetiter.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/27563631615.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba375ed7e---3385284537.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gujubapiwogobuwuvi.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210716125540.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/jilelenoxafas.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7qd1ttvdp0j6l5gei9bqh8bd3/podijejazufapozu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99337a94cd801d0447e8d14119aa99d1/rawejat.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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 17428 bytes
SHA-256: 4ba8bf79cca48f3044f74733f2f0ae9c1c2ab6237a64584450f765ae2083f5c4
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 10724 bytes
SHA-256: c144a0d3a399c1dcc73b1bcd3b0e59cf6cffbf529b54331f21b7c6cb7e972d67

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