Malicious PDF — malware analysis report

Static analysis result for SHA-256 df72bab84bcae69a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 12:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cecc0e331aa384371b244c989e03fc6 SHA-1: 6c9b6e78be56c1aa742f2ef657a7327900787b21 SHA-256: df72bab84bcae69a6623af26bbcafaf231344fd2c51312082929cc2947f47f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hankilfood.com/upfile/files/37783284228.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///81544336938.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/27510657140.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/90781163332.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/85672656654.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613121251ae34---97591013763.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/welopuruvil.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b16edef6a---nalugaduxogukilo.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/61159224278.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gikofovodugixipewijonu.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/kefipipapijigije.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161305a65ae58d---zotovutexuzivivipotale.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/93556200184.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/73289825288.pdfIn PDF document text
    • https://lazerom.pro/media/file/34642319675.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/jilokufaranufu.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/vukoli.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161386e46c165e---34253230371.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/5829710977.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/lonokobilivij.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/62363831263.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/57229856864.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/sazabubesorogusuz.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/timamaranoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=transferer+application+android+vers+sdPDF 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_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 18856 bytes
SHA-256: f4be7639ef76785cea3a4181bc1ea8ed0bf78ac74b3e7453ca10e98b20782bb2
font_01_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 10640 bytes
SHA-256: 74bf3f1af9c140defb5f00b7386a5c27f30f2848410f64c923251799ca8859b0
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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