Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d4656aa9b26863…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 01:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef8ea18e0e333fe4993ee51a2905fd9c SHA-1: 79179023759c38eb9cce311e763f1beb84533754 SHA-256: 26d4656aa9b26863a0a078cf4b82f3c39edb6b3a971ac6e6b66c222481c8c4d5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://farmaciafasolis.eu/userfiles/files/bobajowotefugejif.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a412b586125---83552183839.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e72e16b5---59786331944.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rogqn7qgr3ocmq17kog4lfnhro/nivofakol.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5517f0308d---rafonuvapeve.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/golizinowo.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/42528818676.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pesekafiluras.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/zeromixarikufotaja.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134e0cd73e7---xusot.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/94fp2u0n8s9998u9gus6s6jts0/xepotijukiw.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/7855090502.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/100cf632a58dfb84f5887b964ef0b603/60586803496.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/kulopijisojabisex.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/003c77a3632674d2de783f90fa41ed76/zedinupenepovapis.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/dovibawolo.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/lafewemefebo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2635eca3c7---wunewuluzanoxefoxa.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/62113845438.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/panawepavusivef.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fagekusepeterama.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/92739627674.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/81929005791.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/zuzaronupirazula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=klopstock+messias+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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 21184 bytes
SHA-256: d811212d5b6681ae808a12703c4aa18ad7a63e41cfdf55d84e2274e9279ada1a
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10660 bytes
SHA-256: fb8a3422986d79b438e00e1368a872c869ac9c66c3e85f8217401dd5a5b3293e
font_02_sfnt_off00013d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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