Malicious PDF — malware analysis report

Static analysis result for SHA-256 b077a106d7c01972…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 00:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e295c0e3ea3d201ca36f0798a2229cd8 SHA-1: d8561f44919e8ec83404a0b0058e2a407fc0bdce SHA-256: b077a106d7c019720895d016e15e0f871d2cf3835ef8f7f31cea37fc8b2487d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://getracemirates.com/userfiles/files/tavugufobawotixemugut.pdf In PDF document text
    • https://baptistfriends.org/media/rizap.pdfIn PDF document text
    • http://js-space.de/userfiles/file/vonixirujagika.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6d8e6db298d87a8fd00b52a179052844/zeluresaz.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/gogekafaro.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613073b3098fc---narixobedulanaroromizusa.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/resapejobivetekimu.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/37211427168.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f426abc1e---piledekatobetotodap.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/rososejag.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/58106785791.pdfIn PDF document text
    • http://chayka-svg.ru/files/59869293246.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/wixeserupinozo.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/28633721822.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904091629463631.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/30582849000.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161346020d0c80---jipuxadeke.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/mimudenizavat.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/gelezorixuwab.pdfIn PDF document text
    • https://majubesar.org/contents/files/xejav.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/fopixazomewe.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/pivironanizote.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/75477960000.pdfIn PDF document text
    • http://alkathirilaw.com/userfiles/files/74623899297.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/54648333997.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613056589659b---50102077709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cleo+mods+for+gta+sa+apkPDF 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_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 10768 bytes
SHA-256: e4b0e2bd39a82d610c7994fdbcdd9b91679da08fd9b694238441c2d65505dcbc
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 20108 bytes
SHA-256: d0036da264cc66535268b29c6587197c0a7829853a66bfdd8e8ba95e9e6ab609
font_02_sfnt_off0001329f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1