Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ac9114f2c7f2ab…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36031876c64af249cb2055bfa1620f68 SHA-1: 3ae75633279db0d98979a1f53dac80e402d6cea3 SHA-256: 86ac9114f2c7f2abc84f29dc6926d5460cbdc10c2104a7d5cf29d927683f163f
204 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content likely attempts to trick users into changing payment details or accessing new banking instructions. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggests an attempt to redirect users to malicious sites for further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infinijewelry.com/userfiles/file/59285545708.pdf In PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/guxidaduxuza.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l6up6ad63jvsjusd4nd6cfprmb/dixetaduvinevobolofaxaxe.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f692e3eb007873ff51bbee5d732c96a0/lekigise.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zateguse.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c872b2a5b73---jagejarojazajezorole.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2211573468.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f425f0a43d---34227130641.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/4852446640.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/40061550206.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/16675054541.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/45736126754.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/58604117789.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077044e0e26e---getupaxolimu.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/53897791931.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/nugafibokisoworiwetenego.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/75125434530.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b6d21e8058fa6c8221a787af3be86fd1/6467784997.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f67d2fb7ddd81c6a1c4697b7259dbac0/tofozar.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abf494ce5---27428458802.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/70003618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rewards+definition+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/rosidabafe.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_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 10576 bytes
SHA-256: b356ceb79674be7234981c9e7d5da3a42ab33d35b6e728da631015aa9a643f16
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 17636 bytes
SHA-256: 8d9a81ca96d40d750ce43db0dd170c1ada05fa0eb036fa32a756db3ba257d3d8
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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