Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f42635b70c8a81d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 12:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4c6899bfd40fa946070a9938727e115 SHA-1: 8d41e3598c51d7f34623243bc054a0231332068c SHA-256: 6f42635b70c8a81d98aaeecb4e78533ce8a96729e051f673d55d18c6a6c90b0e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, functioning as a link farm. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=d%C3%A9concentration+et+d%C3%A9centralisation+au+maroc+pdf PDF link annotation
    • http://qca.ch/userfiles/file/pozuto.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28b130c8f3---64355437523.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/gumafamukimuvunaj.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b30eec1a827e9c7bcddf7d61a29a96ec/simujenidirinogezuk.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/12978470304.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/455164733.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/12505905455.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/71a2cf2c9a6ade21da1537214acb3278/guwavezijalo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612158cdc5771---paziwisu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098697dd1484---28469861381.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/pakerebuxewekefepagudik.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/091424025222.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/557da71c42a340612d338b88dc969512/nutitisedowugem.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/pugefaxu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5c9b89e0feb188a1e04a124ec1bf76df/33123292894.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9c5c6c15---78798278649.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b120c861---lixojinot.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/78301532775.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/57171594445.pdfIn PDF document text
    • http://strandedtattoo.net/file/72932294225.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/86756876499.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/tikagebusunuj.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/92764665763.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zinujirixupipipejemeg.pdfIn PDF document text
    • http://identik.hu/editor_up/xiwozu.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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 11036 bytes
SHA-256: 92b43e0dbb58bdca5ef5cd0231c7ed09f1bdef58e7846cd48395f4acfdf9a6de
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 19268 bytes
SHA-256: 620b8faf9c40f3a2a41efb6f87c427f9ab3713669bc3e4e46a62827b1de21550