Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6a9c5d38600d0f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 05:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4c9087a27b561fe549aab5533657e06 SHA-1: 4186aa66c7ef44fa760d35a55980b3ae98c9ce7c SHA-256: 8f6a9c5d38600d0f3c14d8a8096b19a1266930d6524c446cbc76c4224f0f6eb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=how+do+i+use+green+screen+in+imovie PDF link annotation
    • http://www.gulbaharsigorta.com/contentData/file/49546403431.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16092c025dacd1---dulorujolas.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f39fc59fac146fe45a7832c2f9d42b6a/tipoxekedojilubabibod.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/78831598420.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c476ff4d598---meponuwuvugowam.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/433f7203290c78d387e0a01a19428383/zisikomakatuligurojoxin.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tajuzam.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/11461664905.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/5583936696.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c34a9a0966e497c7291b2463c72c852a/42851227010.pdfIn PDF document text
    • http://inercial.es/uploads/files/kipiwideku.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/88698873219.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/mibezugolix.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084e38d8288---15378759462.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/koxadakona.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vofefomukege.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/922142c8e5e96bf22c880f55f098f36d/ranisinatematesumaporen.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/20026206806.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/gusuwufedukelivadegodo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3976b37801---zuzozekiwuweludanebe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48e5dde98---lijejogorofipirup.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7f59fb89f5e970a9e4f0846157035b65/xegilud.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/57094772197.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cc5ca090c---momeletudupegipawimigo.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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 18200 bytes
SHA-256: 581400b14344417f2a8dc9a1c0715660163856e9be4b809f9b7efe83989334f5
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 10652 bytes
SHA-256: 8f1fec3bc5bb0d4a4255402f1d51cd848b2bf63250702b66d54245e564d0d0cc
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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