Malicious PDF — malware analysis report

Static analysis result for SHA-256 9308b6e5949c160d…

MALICIOUS

PDF

102.1 KB Created: 2021-06-26 15:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c537cb9a398c000e2c4f1d4f64fc469c SHA-1: 31d9a704bcacced919cc426ef4415f2809c2482a SHA-256: 9308b6e5949c160df9fc5973290555ccfd3a50ce6666fe1eef193ad9290bfd05
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oreade-breche.fr/userfiles/file/zifebajufotepizagol.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7f89e9068---ziwusigoled.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/tiseliwevigewi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db4193d5c---luvuxagiwanowigepovutami.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789181b766c---806725676.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1c69dab95da0a5adad83aaf95e8ea39e/85501332337.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/lakaxurufusegatabopowoke.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87c8ceebd---dolozinuvamip.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/budelikowalifu.pdfIn PDF document text
    • http://envigest.cz/upload/file/20544982422.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mogubinavisorekudosezajus.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/85098808929.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d59c68eba---38680405059.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/razanafudugaganasijoj.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/sabugumalorolewof.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/mepasezapetorijivaba.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/22734334430.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/979c70424f18fb9b2dede3023ac6558b/kodusa.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/8423731609.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4326f9cb84daf6a432a89706c9ac8ca1/doragiwoxijamikirimu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c7986ff3b21b4045ff42964b559cfc3d/24961178133.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/sanivixad.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160984c0215899---44450871933.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/a5c42570519fa330c76100556e511616/lutibutejuxalaxifatobo.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/janonezimudukiwuzuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stack+and+heap+c%2B%2BPDF 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_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 18124 bytes
SHA-256: 54874f9fee6e4ea460824ef99df02e5a55c9e0cc147c2a1e9beead45aac17333
font_01_sfnt_off00015c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0C 10252 bytes
SHA-256: 89d8e6bd42db761a01477a77b5cd7304ef76e07f075d902ac580f331a6f7ae03
font_02_sfnt_off00017311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1