Malicious PDF — malware analysis report

Static analysis result for SHA-256 722ac53d14bfcd2c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 00:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0b7629676cfb7ad64098f09d2d726ae5 SHA-1: 596251f541d6ffa4da01eaccacd8a2ce911a9f76 SHA-256: 722ac53d14bfcd2c4676e57806c0cf1e380bc7285efcbc45a199e9f9e23bf9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=set+a+fire+down+in+my+soul+chords+pdf PDF link annotation
    • http://rigassprotes.lv/uploadz/file/68696103188.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d7a1800c8a4ea7a9f952087ce03a5966/vujijavitoxe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/gawukudesadu.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/mujorinuso.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/32559320919.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947c48a4a61---8248881307.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b25bc2f3d4ecf3bbfe881e7b829772ea/rabixabevokamuxetaparu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/98605976737.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pbqiqt44t9jh4ldnur2u4ua3h0/37498596904.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3b9cd9f59741bcd90e43348b594df435/darovuvifitunuw.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/fugepokowewaxipitekesajel.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/92401627136.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/pujovajeru.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ea2a119---52177906449.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/dberi1mjq9qa8f490ulsmrlfpq/jolekeniwowunagaguvosama.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/venipisokadit.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210714032030.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/sowow.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b1558bebc4117dde581e5bae04f99415/foxepokonevuj.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3347c4c2f5---6274196557.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejalenepelorubafow.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161135c39464af---27401473944.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/90508037829.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/xivotu.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_off0000c328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC328 17048 bytes
SHA-256: 513ccdaba451dc98d3af88fcc4239010731756685132da033f3e6208f9b0864b
font_01_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 11260 bytes
SHA-256: 246f8a1cfac1556aed25ebb324c23dab6f42291eaf3bd505cc53fe49411c97a6
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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