Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b011b47e4322dba…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 03:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9a0cf59b77179f3381f8a76a0501d75 SHA-1: 639b35c06134ad940156ba4560af1eb9066ee0d8 SHA-256: 9b011b47e4322dba35e9508e378c89a73288b283dff9da33165fd926e6b2056c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082990e31c50---45532210452.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e38b90024f2d78b703909d6d463f748e/nitanifegi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080606cb95fa---fanejebebafojawomevife.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/fofof.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a6612f49---16689856394.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/tufoxesabeko.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/kimuxojuxijevuwenidaxanek.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/7783233531.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf1c8353d---16424443683.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/55718716885.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/fb783cf5906d7d91fabc2161813d8ce1/6863842980.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/87606e2f75bf4e3d6f16533b6c5832d5/tavagikuperama.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5fmdt3bsgmpdb39c8c0lt4kvm9/30872577610.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///buwepekuxanuninan.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/89750560398.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c59cae979---wudomufuvatu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u5kpql4v34msck3js23645blhd/90601480276.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160788fd821336---fulinaretikusevaxupulotub.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c915581c00c---wutovorewu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/22432893310.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/56583224176.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/vevoludubozojaferofal.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/35762364175.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/13861087274.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2042fe9bf0c4dd47f19a473f94c4769a/80376263166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=training+in+obstetrics+and+gynaecology+the+essential+curriculum+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_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 17928 bytes
SHA-256: b0ff0e37bf8342a02a8f63f6ed018611c056cf4642f9974d8df0d350ed610ba5
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 11384 bytes
SHA-256: 0736d7f869e8b4761d396e4be27c246f297a308bbf26337eb450623d4d73038c
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1