Malicious PDF — malware analysis report

Static analysis result for SHA-256 4298dadb5d876d52…

MALICIOUS

PDF

86.5 KB Created: 2021-07-12 17:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5b691aea8ccc0907fbe70c92f669475 SHA-1: a5ca72bb7b5b3431f23f030354133ab895c51c8b SHA-256: 4298dadb5d876d5216a0954e99f8d6cb7b148d449fd2677cc3555bce86217114
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple external URIs and link farm indicators suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=living+spaces+coupon
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d2eff4d65fbeb481e51a138a6ca6ee83/66973427453.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aae891ea627---74266763883.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec177eb62---74136292900.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/da2a72a640c49b9ec070f3c4771f8dfb/lalemanotigijizazovir.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vj2c4aej1qm5e24ge35v0o8hm7/fonexonugofixoluken.pdf
    • http://ascensionchina.com/userfiles/file/36738279908.pdf
    • http://firewheels.pe/userfiles/file/48607567943.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83ddd26c4---98144225498.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370ed55647---mugutinunufanepexobowar.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1f5b9d6ea742a5871f2c7eb97ae4c281/zozodasubiwokaxizi.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/550726c7f93ed324006ad851c0f1710d/migaxixix.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098795fc3ddf---fevibazoremoxora.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a167cc4a76b---17023141520.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed482002b---12373035587.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7024b74d---37747083107.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609039bcc1cad---9174060198.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/92a1e4dd52f147deee7c16eeabd2768e/55699569484.pdf
    • http://starrwindow.com/clients/863399/File/mujijudazuzipalexura.pdf
    • http://sattamatkapatti.com/userfiles/file/sumasosuxemof.pdf
    • http://evevoyance.fr/adh/.-/file/45694069916.pdf
    • http://technology-mp.it/userfiles/files/44429971173.pdf
    • http://gazosilikatnn.ru/uploads/files/losapejibow.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cbce2e96---zemolobojitajebajux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
font_01_sfnt_off00010a08.bin
6296c08eaebb6c192ebcc95541f066f711dc36e1e8fcd3159183eb3903e0a1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 10428 bytes
font_02_sfnt_off000121cc.bin
dc661cfd0df43798b73a6c222161b523c458c7cf5e4f212842db48b7cf7434f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 16716 bytes