Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52d720a1df4fdd9…

MALICIOUS

PDF

259.8 KB Created: 2021-08-05 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03b53ba498078042533e51d06ac785e7 SHA-1: c3fb192f5c5906e0486b67d1814063af54b3f248 SHA-256: b52d720a1df4fdd9c758805d9ebf1e05ebddbf51867d512693366e735ed1641e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs and the nature of the compromised sites indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=the+adventures+of+huckleberry+finn+summary+chapter+29 PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae353dc6b94---48597904184.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160907ff879ef3---47465967690.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/pomoxazew.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/47664498700.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4167bfccd81cb8d199f77ea173b732b0/suvijupadizolo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2a5d16c0---74909448296.pdfIn PDF document text
    • http://labotinnghia.com/img/files/22901792848.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a459ed4c671---23989703203.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/44876458418.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/33134269864.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c369c8a9---49011244715.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d436c5e462dab7ac86d54f62e7f86e7b/nufuzej.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/9k95s6r4vllen9301ckheplavl/satuxa.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/38675021157.pdfIn PDF document text
    • http://atrsara.ir/resource/files/sevafabepufesozo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ug6n1ho62f8tprqasn783lm20/loxoxodegelufanaworako.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd0f587b05---18774969063.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6843bbce---vebadutepi.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/64521606778.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/sukimabofeponamu.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/85095389689.pdfIn PDF document text
    • https://mfdesign.hu/files/file/69687369432.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/47177980962.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b28dbe733---vemudimulirununuxijose.pdfIn PDF document text
    • http://18554080.com/userfiles/file/88324910831.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/8615684873.pdfIn PDF document text
    • 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_off00039fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003b7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B7F6 17108 bytes
SHA-256: 880fadb378ac0c8448242df61b2f08c6e753d5ddcec3b167f49f328bbc7dc0fc
font_02_sfnt_off0003e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E474 11648 bytes
SHA-256: 7407e0fa53f3f6adab374a84c5dd071603049553f5702c646bbd5060960e6b95