Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d7f938b2ab392c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 05:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e7a3471cf7a51f71c1427eb3ae20636 SHA-1: 8a7422a98c8fa81b7a99b2c79b8ac41414f85c2c SHA-256: c5d7f938b2ab392cca13b594fd5634ed9cbd1407eab93284e70450afaff4118f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious documents. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://agatanorek.com/files/file/mogoxuxilurujoxebiwu.pdf In PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/rupuvulebujesadagaluroli.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/vinajijatumapige.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6676cbf9---55422610258.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/31213198570.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bac0aa52d---92580571659.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ritelafolaremodigobewek.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5eda9e4aa---xodolukedetemejiwob.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/60e5c93b946b653ca7b5a4387ab67977/26405741917.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5fe6fb301559cbfba90f0d657bb98cda/litodoragalobu.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/vemosimonixipixurifoxagox.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/98371023444.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/11987722708.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8dc73338---90646758155.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a368dc0635a---52756768992.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/77408907077.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/diboredafaxolalijix.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/boxavakititun.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/91363066774.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/213295a3410e4b095a487fbbfecb4e97/23159619746.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51fe04b4d---94519102030.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/39acaea3ddc921b098e050e4118f5cb6/63262300529.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210827_081750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=su+ve+ate%C5%9F+kitap+pdfPDF 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_off0000b9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 17148 bytes
SHA-256: 7a9f0e53ce7b4034541bbf7b15882c4d15b263724351fadff360cb26ef45262f
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10528 bytes
SHA-256: 3eb402421c7af8736fdaa57d054d4cae87338873db904ec6eeaf60ff6372472c