Malicious PDF — malware analysis report

Static analysis result for SHA-256 296a48e75bf8f144…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 22:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a346cfc9ba178e1860adbba9bffabc5 SHA-1: da56bc24658a02fad08f2315f2315fa0cf0b692a SHA-256: 296a48e75bf8f144e8a2f426405e9e5a6b3f092ae4458f397c643bc1122ccbae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains a large number of external links, many hosted on compromised or disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier strongly indicated maliciousness, and the presence of links pointing to compromised WordPress upload directories further supports a malicious intent, likely to distribute further malware or phishing content.

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://huntic.ru/uplcv?utm_term=best+card+battle+games+android PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b518518b---pedupakutemedabonavop.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/85741225132.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/50852304215.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/17147126410.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/87095132007.pdfIn PDF document text
    • http://quinta.cl/upload/files/bedarosaza.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/91302847574.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910233554.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/zozuboxikepoguguxus.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zipuduluzitenezef.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/lonizagid.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/siwopo.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/juminovaxakogedimav.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/59671710099.pdfIn PDF document text
    • https://stopserv.ru/files/file/bekepawonamebap.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8s0057clvvsb5i5dqdket4ovaa/bejexajolavobege.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/57818546359.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/92654730120.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/pugubas.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodexepurike.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/2267791877.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/39054554905.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/82521481639.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/gafonitivimizuwoguloxi.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_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 17332 bytes
SHA-256: c1cafdd136cac48e050ab6dff2465a59119bfe1d7aaa220c00615c7b28a35f2a
font_01_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 10904 bytes
SHA-256: a4baf4139925f1f03f914b9d483201441212352a091500235696827995cabea4
font_02_sfnt_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1