Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a11e6801e9a3254…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 00:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6082c5a2227425adf539c4ec793c7224 SHA-1: f7acf916325f7aef040184385e4070ef67a2c3f9 SHA-256: 1a11e6801e9a325400e99f5c4dd9a4bb2191c71bf78778e9fefc40712479a06f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://temple.mo/userfiles/file/potuwexoferi.pdf
    • http://sportschoolindex.nl/images/uploads/63550080868.pdf
    • http://agcslohian.com/userfiles/file/godadamut.pdf
    • https://makanbanyak.net/contents//files/76629337457.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2835c8e3---35441756046.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85046e01ab---peviwujituxusosi.pdf
    • http://sadiqandsons.com/userfiles/files/7550149338.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/de23d782dfcf6fa6667275a89a895dc7/konifod.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9814011207289f3dcbf241e46cf463c5/2861127077.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/xugogobilexepexitabi.pdf
    • http://abwhopewell.com/uploads/files/lamixusab.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/8190048519.pdf
    • http://etenindex.nl/images/uploads/85079067494.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2980eb723e---17364607943.pdf
    • http://palet-school.com/files/files/kebutixinewuwutilaku.pdf
    • https://negaratoto.com/contents//files/72012099383.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/sojupegesakemefuvijokom.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/tupefexarawi.pdf
    • http://ajarnveerapong.com/UserFiles/file/96771175971.pdf
    • https://larustt.com/upload/ckfinder/files/80321904420.pdf
    • http://mariangelesorrico.com/galeria/files/fatixupogevezom.pdf
    • https://bataretak.com/img/files/file/wanidowip.pdf
    • https://desense.eu/uploads/wysiwyg/files/voketaki.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16117f967bf91a---64784343689.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+comment+tool
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafd.bin
21c1402ab286abf90b54d523b416ddc6d2dbd75217e66d94c18cc1daa11e2386
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 18056 bytes
font_01_sfnt_off000128e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 16792 bytes
font_02_sfnt_off000140fb.bin
6eb026c8aafde01f57d94eedd2adc6815dc444aafae41bd033287bb290ed72e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x140FB 10116 bytes