Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8a457aa0a2b763…

MALICIOUS

PDF

85.5 KB Created: 2021-08-06 06:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: ec4b6729a71c52dfdaeb08d21d0c6d74 SHA-1: 89f92d435f04aa18347008d5b336bc21c3b323a8 SHA-256: 8c8a457aa0a2b7634a3e734486948bb4ecf2e3fc0901d71bed9d47c0c8b08d49
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript and external URIs, flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to execute a command, likely to bypass macro restrictions and download a secondary payload. The embedded JavaScript and external links suggest a phishing or social engineering attempt to lure the user into executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68c1821eb---52672547889.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96dd3a446---11567113241.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bd28e855c9d00a231770d129c37c6ef8/63544316247.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/4143445276.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/ragixetiworixetumojo.pdfIn PDF document text
    • https://datawire.gr/files/files/xawasudijufovabomedovuluj.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/934b4be3c017d012454bfb0429eaa61e/rekevesabemujijud.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ef324870---75354090357.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608390d5543df---xofifagajegapisu.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/risejopalego.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b31520565ba---wufogube.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/18635364617.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/69903700752.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb937900a---bokozapinunakirev.pdfPDF link annotation
    • http://webdulich.com/js/ckfinder/userfiles/files/lirojunajobedabidimara.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f5c940e39a2cfb52482a20d2e4c94569/nonazuvilos.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f6d40a64542904a8d5855b1df9eb0cd6/kubasiz.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/7535118183.pdfIn PDF document text
    • http://yoron.net/up/files/54032977660.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/80215117472.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tapuzilogusuferivudabafaw.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2f05d088b979e0140a66d98c0ccaf4fa/lakefifisake.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d78b6b721a36fb72d550717c1a93b809/juxozimuzazivadexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+boot+an+ip+offlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 17364 bytes
SHA-256: dc9d62dc8b3848b74481f0df89a57ba4bf7f272941e511f8c194f92b9da6012a
font_01_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 10300 bytes
SHA-256: 6b2d9549b06d0604ae67f1b84796402fdaaa04e42e107c7fe6f5bfe10aaac6ee

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