Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f035a1b34eded4…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 10:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7e587f6d3087b29e4d401d4836d8a5d SHA-1: 61d8aac54b1d0b6e36e1ad18f81c51134e854e54 SHA-256: 25f035a1b34eded480d876ef2095e623c7cbfbbc6cb972207ed32610a33da5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of these links suggests an attempt to redirect users to phishing sites or download further malware.

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://huntic.ru/uplcv?utm_term=figurative+language+worksheet+9+answers PDF link annotation
    • https://drivetripper.com/userfiles2020/files/22296582181.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6f5cfb792e8252cb3dd7d0fd4a9b900a/kitejobajikonenavaxafes.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9da38580b---34066287077.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e065ed2d8b---85706432172.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ee75f41b---rojazatus.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/39431679237.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb63ec4b40---78583061340.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c230f02a0a7---gutolemijikuwekuralimu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1eff1cb11---98845620401.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bejikikisivepivovijimibup.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/visadoletupixukegeburuwut.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/66239798962.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zatogabofodu.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/gufoxepuwezodopugodesano.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b19079f---53963959085.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/21713110158.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/zubiwat.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/80696230792.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/14024134625.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/mipawekojekifatawebe.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/99300387434.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg2ku99fhlmgd9a1rpo6mfi16n/83875830081.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/befijulatizusi.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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10876 bytes
SHA-256: f1efb552bc515df4516419eb52b7d9371a3efe15df354d614b8fbfdd6fabd9db
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 17672 bytes
SHA-256: bd29bcffc99db3056108d47d1b54945134240eb95e57988a85c8a589c72dd8e5