Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e420b99bb0908a…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 20:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c79ea91d0f80d29ecaad30137fe3fcdc SHA-1: 2793d62d2c90e935ab85ea326f86332d2216ffa0 SHA-256: f8e420b99bb0908aba268885c9a48c64dd2f907f66d7cc287cec2776c5e94e56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=reheating+french+fries+in+an+air+fryer PDF link annotation
    • https://thinkhigh-tech.com/d/files/jemexitevenekifadeke.pdfIn PDF document text
    • http://mega.kz/media/upload/files/51204463827.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085677c1c7ba---zizetilujowuzeronuw.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/92372437920.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/68414844305.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7cca1173---12119340997.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210513083835.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/birirulorema.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/63e2e0cf0a06a298e7feec562a823707/sovozaviririni.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/27161594081.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0n2d4cf4f38bi59l7r2k2q469n/nosonipupoj.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/94fe8776517fea7a1889da84828c2446/serulekow.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/96317644698.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/acd9b95eub1g5i240cs7tr3kp2/83979636023.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3426b1f775---74320256783.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ee64cbcc95e1a97503704fd3d5ef68c3/58309401037.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bf4824e4ba9dc8d3bbb4a3340ecb2e27/69794704380.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6ce53b8d---limitiripomuvomosexosufex.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160938055b0313---15171652135.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca6da8af8---31106746705.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/fc3a5da7499d66da0ab40282c436063f/wojaniwimewotizob.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/67328981099.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607914db14046---46569072198.pdfIn PDF document text
    • https://triosms.com/userfiles/file/lololejidebiri.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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 17096 bytes
SHA-256: d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2
font_02_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 10608 bytes
SHA-256: 8769d94f4dfc7b9cbef5001401ef690c64e9137aaee16866a71ff1896c64b6a2