Malicious PDF — malware analysis report

Static analysis result for SHA-256 8076bba23b75df82…

MALICIOUS

PDF

125.6 KB Created: 2021-06-26 18:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dee35a5df829a3225fa829f81ce7641c SHA-1: 20ba2df8099131c5462c0480cf14a741f45c6cc2 SHA-256: 8076bba23b75df82e866a40bc7bf407aef827d5b8cbbd1c401b5a36d2dc6832e
156 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 functions as a link farm, containing numerous URLs pointing to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of formcraft/super-forms plugin upload directories suggest a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cb2b0274---35262590764.pdf In PDF document text
    • http://accronline.com/userfiles/file/zexuxatira.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/sorimejodowiripa.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/27920629151e7a4fe3411d036fb273db/31169943941.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6af257b50---21968794757.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/np8rnppqodenog0s0ravd6ocl3/71473375390.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1d2011d70aeef5e4209c38ca84d0beb1/70554202045.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3739b3e4b8df50115cf5c131a2817544/414970529.pdfIn PDF document text
    • https://autopratichesas.it/file/48519636453.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a01533ff3---99973819751.pdfIn PDF document text
    • http://poorclarescork.ie/images/8136139304.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/vumanejudaguleker.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918540bab5---46186644969.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b265a0e62b---momenafukalor.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075603b10a2b---kusimurafosuxagi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/80257030127.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/zesosizawejev.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca934ff54---tisopaxabekepifaw.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3c384a79---kesekitokujenebov.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f65c47e17bea132f4e06191119b7c082/88598954089.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/26605523360cde265cd402.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24266248e---16384790972.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/94134699337.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3acf4d495d532aaee62a7326c9624a49/31987379758.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/tovebewovexip.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/smvr6b783a5e9nq1ur0cpf3rk3/fuzapinasini.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c0fb6872128a27a8d70c51c7f17f5495/91351460078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chinese+writing+system+historyPDF 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_off00015da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000175c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C0 10576 bytes
SHA-256: c5d6b3acbcedf01a8bc8e574a250da8aad95ae420039d6ec074cac1f294766b1
font_02_sfnt_off00018dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DC6 13332 bytes
SHA-256: 8e58d4c08c126188e3720194eba5ea0809bb4b91a0b006ac708596da374feb0f
font_03_sfnt_off0001b5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5AD 20960 bytes
SHA-256: 2c9a9403a9fc04f49a37cb91516bf556d91f6b2c626e14440d28819f777c2fee

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