Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d48513240e188e7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 06:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0cfc2e6c74a80d1db9511603188cad19 SHA-1: d68fdf98ae2fb461ebbfc3203ed79ea9f8f290e8 SHA-256: 5d48513240e188e7b3051af3c0f180d655c2657a141b25f4a6719c511d64eb73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to serve malicious content. The presence of multiple external URIs and a link farm pattern points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcj00r49f540ieuon3oo3ugkeu/rudiwukaruku.pdf In PDF document text
    • https://badoza.net/userfiles/file/dugewiwakexevijaxigaja.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/84776355717.pdfIn PDF document text
    • http://ccsl.asia/files/48052659921.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/davilatitofojaweluda.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/xeninafokigegajuvaz.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/88742814565.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/88205721000.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f3c91948---94244637444.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2272451d7e29c654df7d243a2941aac1/lozadojivamakaxakemoxun.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/wubuw.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/tenujotiza.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e50ba7f5---jobevijosefefaso.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cf645b0d60a9952e37b2a723b86240ec/tagal.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16106f319d041d---bazosozularanowoni.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/wivizurevusefawakawedupix.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/54564372787.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf78c54d15---bizuvewikef.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077971b83dbb---78965043341.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wupovonofibigujal.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///tupanado.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/16641776367.pdfIn PDF document text
    • http://kfbi.ru/content/file/bedibivigatipivege.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092746fdf97e---sepazagiwelenozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2010+chevy+tahoe+repair+manual+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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 11196 bytes
SHA-256: 6402b80d972ce8818f0039e97f53a981b3e443215e430245a06e0219cef1ee60
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16884 bytes
SHA-256: 5a1d702f4688f7912f538482191e770055ace9c8109c6036797a03be82f8fcf3