Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcc8a100bc497e9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 01:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db9e0c0c38043d4f1e7d4703fcbf564d SHA-1: fbdbe71ebe38ff6a4c0eefe21d3995bd3e8928c3 SHA-256: 1bcc8a100bc497e985b0a5055922f2c3600bb0ba7ad9b6115f067c22b32e7da2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The presence of external URIs and the link farm structure strongly suggest a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607607c7ed6dd---desesug.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb33f02ebc---30370868369.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c59e06ad---mozonolavakedumetizero.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/zudajamakedozufotep.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9413ec8d---likikurasumovosu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608338d4baa04---xigomuv.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/jusufixube.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/24149580668.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1624650887605382498.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/tuzedogamipovos.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/24182444936.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/wevotusovolufoxerof.pdfIn PDF document text
    • http://www.celso.org/download/jabetopasanezunosene.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/70945160654.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/18501188685.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27379023de---bawadusefogubo.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/75701873692.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7c5fed42e41d4d14305109ccc5170a74/lonemerimaz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cece22138---30011188235.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/76766131079.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/ditewirelima.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18a20d54cc0155c0309ca27b85e94c17/ritipenowewovikap.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100dae427a40---tovexemagovoreb.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/komiru.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c4afed19d8d95a0d568e30f13e68482e/zexukagap.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wopelaropewazeduvu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833f914858d---15166403934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=do+puppies+growlPDF 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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10248 bytes
SHA-256: 2798adda0e1f5614c67fb7918bd5ce0bb8ac3a8f4e7b72b12163fe9d7940b73c
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 17884 bytes
SHA-256: 2feb710e38dd0a6c894bf526223ef0f8d9242e4389dc2e9b8ae84f28b987939f
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1