Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa57460f98c19f…

MALICIOUS

PDF

92.2 KB Created: 2021-07-23 02:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5885bc849dcc353c7bf980250ce4bda5 SHA-1: ce24fe68f2ed8566fe15c837acb5fde5585ba9bb SHA-256: a3aa57460f98c19f977f095c13eed5c5c945335f197b1965a16c3a788d76766e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress installations and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://amon-syotengai.com/userfiles/file/7831934506.pdf In PDF document text
    • https://sportsht.com/userfiles/file/1633789343.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088610fc0c86---46997229558.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8da8fe4c---zideluvinejos.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/406e323f51328208a9b7aae34881e6a3/49722187977.pdfIn PDF document text
    • http://iwishop.hu/file/dotelaxeravefegikide.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce67753e06a---19193009930.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd615a900b4---gezum.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/suxemakawurozigak.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/88841396583.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f367f13317---gabokelaluvozina.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e567a67959---64447200068.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/73328040179.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/da6abb90c26147a0c82e996a5ec12e7b/42875649123.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/27815003557.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_083323.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/39286902708.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/weburixirisug.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b9eafdec9b427db68bc96ac584c7e9cc/11353544323.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/denojugosilemusukir.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/29889473563.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e41a171d390ccc4fa01a0d15a6db702b/94254111666.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4218e00d8a3c35e22d776827e4d34f95/82197654929.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ikmeuilr012klntgr4evq6tlce/sakudinalaxukugadexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=it%27s+something+unpredictable+but+in+the+end+is+right+lyricsPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 2788 bytes
SHA-256: 204f4198d81a4510af39ae0c29d624dd5032de94dc507176c6edc6818fafaae5
font_01_sfnt_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 11300 bytes
SHA-256: 43d9327921174e4e627019bc62dbcda09020fcbf3e151a963c15e32da66178dd
font_04_sfnt_off00012fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAD 19472 bytes
SHA-256: 1b8b369740c4a1b95c85b0eab707e806334d9d35617f767c7875c08db43c657f

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