Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b58aa4b6fa2530b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 21:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec48d1fa9360ff7089673f0eb565149d SHA-1: d544ea37070237dcffba9ff1ea1729cd976fd16e SHA-256: 5b58aa4b6fa2530b5c83036476f8a700dbb1bbcf2a013a2b18520c3c9bb2d161
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this, indicating the document's primary purpose is to act as a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=hidden+figures+picture+book+pdf PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/81192220040.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mewinafinewositir.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/rekuwozoxupebit.pdfIn PDF document text
    • http://mp-journal.com/media/file/kabadozasuduvipozejub.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/40624515998.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/46425705744.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zifowajeni.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///42408376363.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/331b155be47fb9e71cf8c8709c295cbf/68637571809.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75750773282.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/2718133930.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/38380103142.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/mofavonatoju.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f317e8cf7f---22459664275.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c22b46bdf6---bakoloduj.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/dilitatojukat.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/92366229172.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a9081dc8b---87183964494.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/katerub.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/931846160.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/51878640661.pdfIn PDF document text
    • http://zuche0551.com/upload/file/wowezuzijutasibezomur.pdfIn PDF document text
    • 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 10912 bytes
SHA-256: 3e0bed80acf87ee36c95fe86b4d0637efe3c2fe49fcb0cc0a3ac85ca9912a6d0
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16120 bytes
SHA-256: 4de0ddf2fd873a970595802feab5ea84547da0b2649f22bf2c9c87c993113ef0
font_02_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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