Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adcef09c7e71d43…

MALICIOUS

PDF

85.5 KB Created: 2021-07-29 21:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 227103d3d39f2387362dcbe11e1464e6 SHA-1: 1afd10e3a5db34031f01edb347f3373faa8bf629 SHA-256: 8adcef09c7e71d43af8524c6fe35dc09ec7a7f4671bf431f01a1a4a2f7b2b500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of a link farm on compromised CMS uploads is a common tactic for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cbc89360---sesasizozitak.pdf In PDF document text
    • http://ausafe.net/images/art/files/41185733616.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/vowakizefusojaluferiwin.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/rolot.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084ecfacdfe8---53897664677.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609488dc05aaa---33404919124.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5431ab5d0---37509929533.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210705_175405.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4947a4d7a---3058121805.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/96330614226.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/pagotazexaponode.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097faac8a82b---79368992840.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fegogizamosekubet.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fegimezederivifimav.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/zifedinomibunazujovibuk.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/91364815458.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb963db6c9---51095487035.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/87770699169.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/95448385194.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/fifun.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079a65805bf2---sawak.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/66664255583.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f91d537c---xufojage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+vs+street+fighter+apk+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10992 bytes
SHA-256: 27ce85234fabb0736cd8d27d61dfe7db319ef559153b9020a552a8d06302e702
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 3036 bytes
SHA-256: e6f0b9abb137a493570b2bef021e128a1d05ad8b9821803386ba40bb5a04cddc
font_03_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 17316 bytes
SHA-256: ea590d94a43f80c081e5f0706b8f8e9a6c4bd13e8297aa1cd89e757e3b01d994

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