Malicious PDF — malware analysis report

Static analysis result for SHA-256 15949d12e3a8abeb…

MALICIOUS

PDF

94.6 KB Created: 2021-07-24 22:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b1e498d22a7bd1d3be40614c228dc83 SHA-1: 79842043212941d84e2e78298888b37427ed144c SHA-256: 15949d12e3a8abeb53b7538a9090e320893592f31f085ce40c0d22a180bc8d37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs hosted on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099085780384---foxisexe.pdf In PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/9b4c537583bd3e4b49190f1f0b9ebf1c/kifogurozudajezigupab.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/30654825974.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/74407111207.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/14507507144.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd687a04dd---pewanokeb.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76ce1b0287b2e4dd334006ef3aa61193/pixajasutut.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/98305392740.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/lifefeworaripurilinapum.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a113efb3659---41994212119.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9dc5a529---27886592133.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b0061ca3---potetemezunida.pdfIn PDF document text
    • https://triosms.com/userfiles/file/32992779081.pdfIn PDF document text
    • http://yuha.be/_files/file/51714223816.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/vavuwezakerewebomawiju.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ea757512175f8f6f1c6b39cfbc25086f/pajola.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/7329429955.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082761fca90c---87200618318.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/74489295618.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/89cd1a7534d5aa9985e584c5d3b5d060/fumevozilufodibagadafo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a8dc3d71d---lojawigitezus.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/svg0pocuusmqia24vfurr5aua0/45085297386.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/49125913627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=millionaire+success+habits+pdf+espa%C3%B1olPDF 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_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 11156 bytes
SHA-256: e9834da8f77413100ebcd1b06791568c042cf2d92404b204ab82e350a6c31c99
font_01_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D15 16992 bytes
SHA-256: 1a0e4f5941ec2a242496471a68372d9bff887e3d4d3d1c6772def03f78a7ae89