Malicious PDF — malware analysis report

Static analysis result for SHA-256 493fa21705fab64e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 15:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aaa407283ee6c0aad06622d8400402a9 SHA-1: 27f951df4f9958a40fcf34277a25cf38eab8bf07 SHA-256: 493fa21705fab64ec53b6401870c90f2a897923c8a9f2338ec4d283d3469fdb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=perfect+world+fly+with+me+apk PDF link annotation
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930131c48a---87007144277.pdfIn PDF document text
    • http://ge-mak.com/files/4036525691.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141735c4afbb---sugow.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wujezawukosaveka.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/koziwitiwuk.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/458649895.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef2890f4b---78621395366.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/88860456047.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/18749583208.pdfIn PDF document text
    • http://irollee.com/userfiles/file/xuwoforizilumozufukut.pdfIn PDF document text
    • http://annabarons.lv/files/files/58607125831.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/josefetivesavuzup.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/xafoverolig.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/78805737582.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/56c1598950922fc6c1c96615e6ede4b6/87721991543.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/9311132731.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vegasudivodija.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/turagede.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/53719421443.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/76650066530.pdfIn PDF document text
    • http://konberdbio.com/upload/files/55286395370.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515718b400---88353847788.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/popozakube.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_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 20208 bytes
SHA-256: 0e5580214032bb2d452b27f04fefa0b923daacb3c4e589605b7ac8b3dc5b7af5
font_01_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 10904 bytes
SHA-256: 7a64e2ffc0eabf5f9cc5816cee803174251094853262357c85958815a133e42c
font_02_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1