Malicious PDF — malware analysis report

Static analysis result for SHA-256 2314e8f834830080…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 09:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f17af78930449da66980116aed3594a2 SHA-1: 27c31492dc63e4dd86cb76596954dbf72187e78a SHA-256: 2314e8f834830080e03f74c993c09ea524d931d20528cf2c3efbb397ba0e6a85
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161329876def6f---16135601890.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/01c34ebc827243aa72d63831845528a1/pegaxebemokubuvus.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/12351983153.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/nofigufibosiwivemosovo.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/rumowabonogezewad.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/80569481605.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tuvilejepolopodedivesan.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/koxisos.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/19149994610.pdfIn PDF document text
    • http://fruitvita.com/files/files/74406216832.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/44096944320.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vusabogutidijerepejit.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/koxakivafatititadik.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/33344087782.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354326e7c83---satotomijekosesuvebaxagi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16130168abf60d---90748308091.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f17aef371---85761163738.pdfIn PDF document text
    • http://klemanpince.hu/files/file/gevizoti.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/24561503993.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/67191471123.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/23100134946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=boku+no+hero+academia+heroes+rising+english+dubPDF 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_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 18408 bytes
SHA-256: 27a0e8d7503110c85631ea1f04e09ffa185a9160bc906caa08d8b54b474f0c47
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 11104 bytes
SHA-256: 6b16eb00ee96a195121692e9e63b49ade7a6946f750299bf9aa989986ea0dda1