Malicious PDF — malware analysis report

Static analysis result for SHA-256 48077f68f4650cad…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 00:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c96138cd267805da91252fba990d272b SHA-1: 4037d764966fbcaa7ee483d956a0328ebfbcbf5d SHA-256: 48077f68f4650cad18df2188123d1f9a215a62407be2fbfb48c227a4afa00fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to other PDF files, many hosted on suspicious or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm patterns suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://thehero88vip.com/ckfinder/images_store/files/43121286071.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/68509409238.pdfIn PDF document text
    • https://mmszke.hu/files/file/xabupapox.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/66539862183.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/02021075f9aa9fd24cf2063ff8090ad2/gowufidigilinof.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/fujuvavov.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d03a3aceec67a2159529061dd39ab45b/nuguzepakes.pdfIn PDF document text
    • https://777mto.info/contents/files/2888632878.pdfIn PDF document text
    • https://digireg.sk/upload/16362928817.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1f0lvggrh7b97g9032h6hf1b33/69662503406.pdfIn PDF document text
    • https://temahr.hr/files/43135873444.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/59674312575.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608695f2ac815---26652198222.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xoxapon.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec42e17b25---30063335368.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/78147804239.pdfIn PDF document text
    • http://ailizia.com/userfiles/zijikanitudazulavi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/70490612588.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c86ac797d06434d58ed8a165d3fb0f00/fifaponovopefow.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/28086742795.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/80189891490.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/25f56013e2dc2433f0c7abbc28f5381d/mizawel.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/26146848852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=oxford+solutions+upper+intermediate+teacher%27s+book+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011b12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B12 16804 bytes
SHA-256: 452893b078f1085c55a3b66b8c1389960b6c2f64c53f3c0dc0d36824b896a151
font_00_sfnt_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 22208 bytes
SHA-256: d227717225a09dd5d68290d077a5826950c3a7dbc2623ff5e617146b70c1e725
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 11376 bytes
SHA-256: 186a25ce094ac73aed4479e9fdfcd9e3987d03245870b974a25dec02df47d7db
font_04_sfnt_off00014d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6B 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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