Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c348c146fc525c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-22 19:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c6b8bec0d4d566ad9ad99ee6f516da9 SHA-1: e91c3a3456a22f153cbcc480dc0a6d97a9eff063 SHA-256: c1c348c146fc525c16d6886f18072025b2ea9862f54dd887d32e03d3c782f5e2
176 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics point to a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cabsfromheathrow.com/userfiles/file/gokava.pdf In PDF document text
    • http://petra-koparki.pl/Upload/file/60616992338.pdfIn PDF document text
    • http://clickvay.com/upload/files/89726670898.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5e5035af---jabuzizoratilulovaxebuwam.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0c41571e537e649295ae33afef682279/86465169285.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/9812330459.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/gesujamabumukinimonida.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/79939863543.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/84189654451.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c51c29a---nesozetakofafe.pdfIn PDF document text
    • http://saydersan.com/firma/files/20143295459.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/46492469627.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/xalikuvuba.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/nilixojerukokufimefaduxe.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/zobiwumuj.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109071335049700.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/75965300128.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/29202934369.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905014836.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/bakidumejuzarobo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/63438846759.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614546b30df75---ruwekeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=about+latest+android+versionPDF 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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 10528 bytes
SHA-256: f8b589bb1866a8dade90330bd1c2466b0d3ee3b620258dc1d3eee00147e2b961
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 17604 bytes
SHA-256: 60cccc42bb0738274408f40bf8afc8d620ee6cb4507dcbf2a3f9525196dfe3ae

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