Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa213b5b5d0fdac0…

MALICIOUS

PDF

89.9 KB Created: 2021-07-17 00:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72548b1a3e70535dc21119e2aad8325d SHA-1: 7b9d22a3851d31b680bba2335788d9efd5f0d609 SHA-256: fa213b5b5d0fdac04c5811aa42b91955076bd234165c14e86cf4dadf50ed461a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution 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 http://www.srijonihealinghome.com/fckimages/file/pejewomijupibuvosirekew.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a490df2025---narojajalaturolin.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0d525030---70590671356.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dede7d1c8c---43777056734.pdf
    • http://daoltrading.com/userData/board/file/81069820705.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/levg49nv0vbd25g4018hiqfa51/63485312226.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7261fde6d4bf3f3c1b4bf1c96f7a3e22/61192894470.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07500cbca---24115798404.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b0854962cde0eba641d4c8648f98df2b/92517542183.pdf
    • http://buchtel1967.com/clients/26382/File/vubarewab.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e89d5f65686---nobodutilipilukak.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/298h6l5pjqpbdfeu0i2v8fhbq6/93331800617.pdf
    • https://lochoanggia.com/upload/files/46071876861.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7763180a718676477536ad7a122acfba/zopesiwobitasovebo.pdf
    • http://tourister.kr/userfiles/file/vufawefivu.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17da6c73f3dd1e07ff08735911ca2371/28585457903.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/suruxitani.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/ruzavolukere.pdf
    • http://www.awakohchang.com/image/upload/File/ezigewexuloful.pdf
    • https://takipbizde.com/calisma2/files/uploads/44842652086.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ibvh51ku3eer1sve8l3p4ccsc0/kepalegekarotox.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa0dc1424---zobajiwupowinumuv.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983748ba4dd---87846240057.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parkinson+wellness+recovery
    • 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_off0000fe80.bin
940fd42303d400a54831c8c45770c73233fe0ec7997faa326477c951c25ff2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 16396 bytes
font_01_sfnt_off00012914.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 16792 bytes
font_02_sfnt_off0001412b.bin
8328d0b4f36059d1423cbbbccadf3a3d403e238de1ba39be4a14629b3752cbee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1412B 10484 bytes