Malicious PDF — malware analysis report

Static analysis result for SHA-256 809357d0ed97ce7a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 06:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 706fa0131f6a83ef82feeff09200026e SHA-1: b97542d3437ca584fe2aec9e65f3adfa98008a19 SHA-256: 809357d0ed97ce7a9fbec301f7a1743309f64dfe4fa5a521572ef024ea046e88
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://best-infosystems.com/userfiles/file/8048451545.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a314d65d48e---92013707450.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/pozepudezipefewipuritaja.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210816062757.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsb3p0bmnfllkjam3vr9sjs6sp/vujowonuvugutuvagijosur.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///wewiwubewebolu.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/pifagajexopuri.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/74025310920.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4825b72d2---66090020789.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/manadekofowem.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kizanudalogamumu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mibevenafeguvazax.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pofalululirepefinivalolot.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0648b098a49efe5baaebcbde47871905/gozime.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7892b2f63f5e6b97b834d9f2c5b7b335/jefokojokam.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/38828769472.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160adb81b4d3fa---lunefawalowasojomokiw.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0010023001619859979.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a738e10e6ca---72357787411.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/jisipifagasivubutifuwigu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16121c38db917c---lojomaribuduj.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b2cb693d23031dcd3c050097e3856803/gadik.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/63778425789.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/as70p03jehb8i6o98laam6m5e3/wezitifik.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sepexuwonigunud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vedic+maths+book+free+pdf+downloadPDF 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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 11172 bytes
SHA-256: 263c6a5cea22ad7bb7e3a76c2a00cfce5dd0cfe22eea07d2515265283f264938
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 19196 bytes
SHA-256: eac4c6a2441b410e0ddd661711b883bc8a55363909e842037e9fafb4f9ec9edd
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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