Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d211e39f7b4cec8…

MALICIOUS

PDF

90.2 KB Created: 2021-08-05 20:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b951972128071d9f121473e2813df6a7 SHA-1: cb62db02a92e860a8ec3c7a539cf34c5e3cdfb47 SHA-256: 5d211e39f7b4cec89b3d2952bb5111f658634c24b04068836f2e2fc1cbdce35f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of multiple external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://makesomenoise.hu/upload/file/ranemonisebifewemoki.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/niranagivezumeg.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/8720625100.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/sovevopilosopaz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825231cd800---gagimulipajuporaxafiburef.pdfIn PDF document text
    • http://henca.com/files/details/file/mavififatir.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rhhsfl0tv72mihb74kml3llovp/kujuw.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/24232127972.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nudibexunukajudedu.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zuxedufasobaranab.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/18923966792.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160770436196f2---87164337742.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4094f8010535ab4d1aa7dbe510f9b37/46614311838.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/29218268150.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b4e096ad9efcb360680b8bc847f0cc15/36123921817.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/338c58ff4dfbd307e81306ba9671b387/84199497904.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/71d255f455aa3c68d10e1cb5efb80ce2/tezegu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42aec67122---modujununosudukux.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zigasepafukeloromajo.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/8321379850.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d7b0bda1b8d13b6b1fdb56b10bcee6f9/nogosadijobizitemaje.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b275a495d15---81709471463.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/92960198285.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a67a4eef226---fajagozapobizu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/lalaxubamewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=como+ganar+el+melate+pdfPDF 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_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 18064 bytes
SHA-256: 0564e861778379caa75d4cbadc744a974a13f2cd16d8b87fc2747c6c961fd898
font_01_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 10612 bytes
SHA-256: d1046e9f43d8fb7d1d94c195c3d56ee3088fd19751898c3343b0ad22ad6c6a74

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