Malicious PDF — malware analysis report

Static analysis result for SHA-256 904af43391c09004…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 11:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f77fccf3b5adb8b796e61eb7d2ad390 SHA-1: bf09c1ef34b3a60b1d9aae8ea2cb2b3f004a2c1f SHA-256: 904af43391c09004de6023990de5583c3d4c7c07ab3e6704b78b73bdde76047e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://annabarons.lv/files/files/3114402959.pdf In PDF document text
    • https://amd-export.com/site/upload/file/54995455547.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/zibekujud.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/sejegebowovutowoxudo.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ripejefar.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d2683a540f89e0b3af0924259d375495/73020624392.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vodugivek.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/10577565268.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/folotaxifoxu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/msovi7jcv7cc6nohs13ho83lf9/zofezorakozipesarobuve.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/kosikunazadeto.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/37173619630.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16112bf36a0cf2---98370136718.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0dql1vb3qnhspkb38pj6n281fj/64108840512.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/978bb2ee9d86cd03cfe12666ceb864a2/nobazutudopi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47475e4ea3eee686cb1d71c0b6a4e97b/napufujofewulud.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35b648708---73468573738.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ff1b1e80---gugomunenoke.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f79f18a3---467746222.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/98331260945.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/82753660988.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/jizalasiduzifapuxedonof.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5911db3b0---35182942287.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/dilajitepunalafiwumijebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=overture+to+candide+score+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 19912 bytes
SHA-256: 86396593e3318386ed4f32fca7481c655c83c82c3e3e95bcfa36757580f5e9d2
font_02_sfnt_off000130b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 10756 bytes
SHA-256: ca66247872d99709c70f6315d46852e6ffb78b3bd831321a7af51a6e68379479

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