Malicious PDF — malware analysis report

Static analysis result for SHA-256 765552066c77475d…

MALICIOUS

PDF

75.9 KB Created: 2021-10-04 06:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 21cf7476ce9c0df1b9c5009eb38a45ae SHA-1: 7895ab05f36755b39d06571fdc503f48ecbe1330 SHA-256: 765552066c77475d322492178b8d63db67616bb407d4793384b5c1428fe59d16
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vibratingsieve.com/d/files/21755047168.pdf In PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/pogolutofipemabimojomeko.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/83139927880.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rujitu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8hll76bhh8ntddk2vcm7nashha/66005960968.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109180720203979.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/kijogogekimigefajixogak.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/mowamubowujopuzexosababo.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xufujinizafizofexodi.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/zipabezonojeror.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/93464492441.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/2794043817.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158307e0189b---tusesesabipulofewelilegok.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/35352510583.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vudixiziradetibototulijan.pdfIn PDF document text
    • https://haidangpc.com/contents/files/xesusugumokazadox.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc916d0a36---92182239861.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/44523996922.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c2f27b92---waxubaduxigetiz.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/65071161340.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/gipaziripaxag.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318d1055610---toparirasasobiv.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/95001307375.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/gikabotalodo.pdfIn PDF document text
    • https://ms02bet.com/contents/files/tadatulowifin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=class+9+science+s+chand+solutionsPDF 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_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 10668 bytes
SHA-256: b9d63d5445112fdb38cf6a7ca133fe738716146bb68c396ded778a2c42035f23
font_01_sfnt_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 18196 bytes
SHA-256: 86b5827319b1b50ce8a8f7a11b66e189c2f856125a2985196d85855d39e78f10

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