Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c30ff72f16e5eff…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 01:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 578a6cac15a3b3e9f53ee09d26075e75 SHA-1: 15b717389ed0a9ccb42ab868a8e787ab826aed79 SHA-256: 4c30ff72f16e5effdb962e14ef8043ed9e136f113edff3439746325a5a442474
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve to redirect users to phishing or malware distribution sites, making the primary attack pattern the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/57af61e7bbb66e930ae17dc8e8b3550a/sekab.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160944a2d81269---towekuvufax.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fef4c426ee8b9f273553b4f8dcd2615c/dupiragaxiboturop.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xutafevo.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/jubiwolit.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58c340fc4---65099551782.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a14685dc---momep.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/gatasoguzojetipuwezurazi.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/73288346955.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8920df0c---72005912270.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d0a7c395bf89af4560a86e15df200374/mirebipivokarogatuwefimit.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/82832927159.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/939f375313d056e4408f6ea4cb769423/77659780735.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/vetodotajonagelitatumux.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/6998a18eacd394c0e5f3cb65a1292b1d/55246048241.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/bonaxeruwunagave.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/rokesijawimawa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c4744a6---pulofevel.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9a1426a3caf677e7d3841ca253264f0e/zubovuxuvevewudowa.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kn9kk86oa43jnon1olkt8p4jps/23590201395.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f2af8249d5893131cdd4045aef2383cb/42575544629.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d20e0447f9603f096f78174610401ae0/32909343552.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/87178495261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+overrated+meanPDF 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_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 10436 bytes
SHA-256: 1d680b6828d38fbabc32d1ef788b14288c30aa52c2f6651c41796ae74e144cd4
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 18080 bytes
SHA-256: 0016655f268fec30c9878536d4ad176e0085192e9e99b1612387603ca104645f

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