Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d36aeabc003588…

MALICIOUS

PDF

69.4 KB Created: 2021-10-09 00:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6c86a4ce47b2f70a7fb627d219c21a6 SHA-1: 07a8d2930a5cec3ac7da579885ff2b3c254c3007 SHA-256: 58d36aeabc003588a7cf18ae3f5d831e64a19d58386af1b87333107426d1c266
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad7bd0e7f---52668973748.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/fapajujazobaxunuvol.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/zavubutoga.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/navudejedo.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/51474928826.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tulojutilamiputo.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/bonobevotez.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/satikufu.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/62647860342.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/53142957690.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/zilezal.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/24768019958.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xosaruletosejevezimaloneb.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/77942779328.pdfIn PDF document text
    • https://777mto.org/contents/files/lijotixezanunizijifojateg.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/55014146374.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/24150147095.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/sinagezijogaxisaguran.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/45587727916.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/gekebaxalamozanovefegaga.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613999234ca6d---396489366.pdfIn PDF document text
    • http://storemisr.com/uploads/files/16590931577.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/18258802942.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141aaef8042f---wuzawukipadodipedi.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sawedatalijuwote.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/15310885124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+can+replace+borax+in+slimePDF 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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 10876 bytes
SHA-256: fe4432bcdfdbb611451b7a165d388604d45f0370f40e60f16ea68c3d89db36d0
font_01_sfnt_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 14660 bytes
SHA-256: 323c47f25f6c4eccc4d8a3f4c3d4d8e7d5b6ae369972335dd6819c58ff2ce67d