Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1037d4cef90b71…

MALICIOUS

PDF

95.6 KB Created: 2021-07-29 20:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb96fce1986b517352d915b5fdbd9b8f SHA-1: 9ec1b9add59d0d90e2be8671ce39ada557b1ae3a SHA-256: cd1037d4cef90b7102ad6c08898d9e68b9b83c8865687f94001990a097aa065e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9c0fc73932b4c72203bd51a22edbc345/vadal.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/08638c50e4b500ae69a43b9df6da8df0/zipunodavokizawazowugaf.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/wodiv.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/fiwurije.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/begabaw.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/wupekenodidis.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kolaxurij.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1b3duc24e1ujt9iftgjibdocuf/91469546437.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/866efaab6df98c6769608bb5f7fe2222/gagugeropo.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/34268065629.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/915eaf9d55de1c39bd6d931b9387a9e6/9950881419.pdfIn PDF document text
    • http://gerocuki.hu/user/file/83956442028.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/d3cea8f219b50f22165cd13c4bd04653/fevififisedofipejusa.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/7289034703.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/pldk1gffjmjbb2jl11ts758jh3/72525436765.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u1s226997m88c3ld1a97l68q63/4653055607.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/bapirotebatufigojetubami.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160edf307df44a---nomomevadajiteleronavelet.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d1147026---fegajopepesipo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/54390289438.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/3oki6k05dbjp9pgl803q6025e1/defelezil.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f90749f2---wuvomawinomujazetedifokaf.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/98510779168.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160db60f678a90---basixubokefugamazokopuji.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/6647659174.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/32598992044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+san+andreas+sevgili+modu+indirPDF 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_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 20032 bytes
SHA-256: 8e08f4b72b0084cdaaebbeca5efd9c3295172bc31081e5b171b23c7159e6cc4a
font_01_sfnt_off00013e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B0 10796 bytes
SHA-256: b2efecb44b3406c31824ee2b5a858f0dc5c8b161bfbb208e87bd5a46a46d135e