Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46cd41240769357…

MALICIOUS

PDF

84.5 KB Created: 2021-08-07 08:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e352175aa9661d1c251d6cd99ef460e5 SHA-1: 09a34396e331953100315ccfe477e242ffca9289 SHA-256: d46cd41240769357d9f261bbaccc20c3bf77a0ca585c97a3f59ecf6f26445ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jjkxmy.com/upload/files/202107280454028582.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea9e3b8ada---tewomaselojitekeguzizef.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/11684898368.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/30310784152.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/rekowerize.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/13947673484.pdfIn PDF document text
    • https://arerp.kr/data/file///87248214024.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e6808ba76aa357323a86df9d5e3ba82b/69033908881.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lojabomanerenatamixe.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/nikusebenapodus.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/726adfaa9a8e3b7321aa84556b533e78/20991189513.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/31054992999.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/xoxuzodatorenilif.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4l6987dh492vvas08tcq3sblkb/94844341347.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9c4260c4---8066472686.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/86569301155.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f512d199d7---48755496533.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/pidazase.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f071eac5---60509566587.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fcc074091---fomeriparo.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210513171256.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081426b7faa6---62631560088.pdfIn PDF document text
    • https://ovalpolycoats.com/media/xupagafuribugegakat.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16072270c8e053---takezoneta.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9842fbfcfdf111b94fb8b7975cbae968/48717450185.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/bozitapumoguvij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=age+of+empires+3+no+cd+key+crackPDF 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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 17972 bytes
SHA-256: 7b614b316f4678dd7c24ce2273555d1740668ff4272a9f5392060f553d073f8d
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 11176 bytes
SHA-256: ce2021532feee1e6061c68dc178ff638f18899fb6825148d40eda56501629fd0