Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f78e469690b472…

MALICIOUS

PDF

84.4 KB Created: 2021-08-19 15:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90dadec5d3ab798b8f462fbb45905042 SHA-1: 82b3139172cb1682212450e3937568b4a21533ca SHA-256: 63f78e469690b47230d8441313743e39d295c36655d69c865291bbb6fefb305e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to obscure the ultimate destination of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://coretry.ru/uplcv?utm_term=how+to+make+a+funeral+program+for+free PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gr0rhecejudbo678u6kvmphui2/72831628484.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60bd10398---zinukilazetogibugomezo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52820537953.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xofumejoni.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/fufojepegewepobu.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/23979522423.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bb39309551c212578c5818149944b2df/bafana.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/43170433757.pdfIn PDF document text
    • http://apvn.info/userfiles/file/mewewuwejudabale.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/vesevafasurufotufiba.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b278dff4e8fdd809609ae4bf0285287/29793835616.pdfIn PDF document text
    • http://01host.ru/userfiles/files/pufek.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p0foilbhpqfvkp91cmbj5p3a3k/12083078067.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/47724740252.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/54483617818.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec8a74059---81811824491.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/97c7121e6bfb91d779add7befa5c2bef/65177249132.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/joletevarekegodarowilo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/26769955370.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-14/20210514214925828375.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83a696bec---kufutilobarizom.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/830b72c6fb31652efda87d4f665f33f3/zivijugutotato.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607662387da35---12482435875.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tk9gmvake1hrudukuuffq3cd65/85919887173.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b05d0e251---58860412508.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3fc04b6ab---lesifoze.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_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 10708 bytes
SHA-256: 925946c38677109d96572af088a0134db4ce1ea2999a044633c218f4930586ef
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 16764 bytes
SHA-256: 0913b5006980449b815c8e1aeb1d9ac90f1ad47395c17c67d91fef276bc0becd
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1