Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f271f228851ea0c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 20:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27c06d9e1379b0640b63078b2e46eb5e SHA-1: 9cf7868f959206257704d90f5f46e6b6e8a7d974 SHA-256: 4f271f228851ea0c2e4254e155692021332cb04479a0489946c0ef1c572949fa
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links pointing to compromised WordPress sites. These links are likely used to manipulate search engine rankings or redirect users to malicious content. No scripts were extracted, but the presence of multiple external links suggests an attempt to lead the user to a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=what+is+a+characteristic+of+udp PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1ed58a922b6c40668a44fa56ee035d6e/75206906310.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fepugosabiwa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c80448aec---fexofikufi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7956e47---sobomizuwososaxinel.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c191fccdd4d---zilij.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ev74lvr2vo807uav8jfbqupvjd/mejenipolafetulejiboju.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664522d87a---98406046726.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b85ae0b46---sagaletid.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3eafd9201---17190645965.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/199c19a4c8196527738e675815c200d6/85413635597.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/tidezi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5s1f1c2uh7col46c6vkggl9c2g/rofaduxuliwugiluwepalevu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/41a2e5ae51dd7dc464d4cf43fe23abc5/fudejexobuki.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/45290962031.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vulodevolukonoro.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607987b9260c3---dagatenojaxevibibulawas.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/nukunob.pdfIn PDF document text
    • http://kag.fr/userfiles/file/74334850328.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/rawis.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ad7c1a65f30662e08ce598666cfe930/43133746181.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/28411098186.pdfIn PDF document text
    • http://salkim.com/userfiles/file/welizebeb.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5583a6103c---joruxisexufumetafobika.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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10660 bytes
SHA-256: 97c740d4be176cc54549f21df2c800a582f0ce65e733db8f3cd9db31741597a0
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 18180 bytes
SHA-256: 777718a42deb3c72d5f7b7d9ee44c3eeb582e2ad23bf14630b3dde0d078188f9
font_02_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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