Malicious PDF — malware analysis report

Static analysis result for SHA-256 595346b7c01cc2f4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 18:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ae5b5c1ba921f02c0e9b15313fbf1f7 SHA-1: fd3d31c9c046abed4abefea02ecec2e866b380bd SHA-256: 595346b7c01cc2f4e018b92b0fde316c2d05783d1f6165abae2b215fcfb5702d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6fcac04c---fikajapazetamav.pdf In PDF document text
    • http://pescepiana.eu/userfiles/files/73826114803.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/10418104425.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/zegusigakazepevuwa.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/lojamaxeko.pdfIn PDF document text
    • https://sim2007.com/files/71440410944.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/45484101562.pdfIn PDF document text
    • http://adice-area.com/pictures/files/dubakedofimedenuvewi.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77127281688.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/xeraxosopobozasobegaj.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/damitiwifobikiz.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zanewibutob.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zulefumigonu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ed7e52a847b162c55653f0a459625b51/63484578979.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/3222303531.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/bebena.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/89373461692.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/28975812507.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/9624371180.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cnmaei2ld6vh646bp0edkl27l6/fukawivexurawabulifetasut.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/41706264520.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/46379609267.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/vezaribedebirewaluxabo.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelenobovonez.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/6537596026.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/5407896177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+good+witch+online+freePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/75832549292.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10476 bytes
SHA-256: 43a924a1be15e87bea10dc645cba976598267d8bdc48d5af3412c29f59b52d49
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 18028 bytes
SHA-256: 28bfb9d5283a38a219c0e1d07d50b40e431519074466ac88bb9576413031c6da