Malicious PDF — malware analysis report

Static analysis result for SHA-256 0104051ce9833a4b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 01:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 313a20ec372a6dc5ba46c36375cd2a39 SHA-1: 01361f010486120c1ff391cb882c1f030a7bd2e5 SHA-256: 0104051ce9833a4bae4ab4950f1a7285d46e459282c0fab262a9ff27466c2cf4
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many distinct hosts and a high number of links per host. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. The embedded URLs, while some are marked benign, point to compromised CMS upload storage and disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a7870747---22166448833.pdf In PDF document text
    • https://privatecambodiatour.com/userfiles/file/5397487936.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vunalufalokudazapun.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210907170014.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/87735733079.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/bimubotanoxadadozofuga.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/99076753482.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nunodekopatepodebe.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/54645711712.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/funosojofozuxoximifi.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/62781571697.pdfIn PDF document text
    • http://bluebossa.pl/files/file/25679991398.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jenasibovirudakomafij.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/jekezawajan.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/82019655336.pdfIn PDF document text
    • http://cpils.com/userfiles/file/zodide.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c1abf7dd---20449975875.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/vijijimivolafenasovipeg.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/kumukijakuwovarexufibatoj.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/26828109466.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71411189939.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/50749893291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=go+ask+alice+pdf+downloadPDF 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 17568 bytes
SHA-256: 39f2233af51790c162c47954006a2cb2e8c010e97364f7381cd35b3946fdfb18
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 10632 bytes
SHA-256: 6a1b56642444cafb4dba4c3ecb6147fed047bb8853f24d5ffd85f4f2beefa119