Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6fb19ff306a4bb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 20:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ee423339ebedae6623c41a182bcc2c1 SHA-1: f41af97de3359507095a76ad898e2aea4ea3c977 SHA-256: da6fb19ff306a4bb8dfd32e0f67da75a14c220c08e024d92e5b71262c8a468be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://irinabailey.com/upload/files/kexozokujuwomufalafopip.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/gozelebakikosexi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/worigusu.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/72839855042.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911033144963986.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tujasizovurebowuv.pdfIn PDF document text
    • http://cssh.es/img/file/43316261096.pdfIn PDF document text
    • https://ratodua.com/contents/files/ruxuruburefimadebavazigu.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/12838595884.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/46a34fbd9442f4f5b714aa4ac11a33b8/fobomog.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/jejumizukepubutimirutevi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2345bd227---tonogepegabupubaw.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gapumogivesimajilazosusi.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/manewilinir.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tatakewirewojujejiwujazul.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/vurazusenugawaxexagop.pdfIn PDF document text
    • https://grouptm2.com/contents/files/kuzolaw.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/nivigabagap.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/63222293722.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/40190806312.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gavuruzuladodozutob.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xosurimiru.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/butaledimovunev.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a2372d66c6342dbf76fe3c08077900cc/zitenaludarelukerimiga.pdfIn PDF document text
    • https://adikkedua.com/contents/files/3472722410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+good+day+to+die+hard+castPDF 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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10592 bytes
SHA-256: a27bfcd9085a759f04a8a747c993b9802c90a7b7e5f26a08a0e3fde15e159991
font_02_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 16940 bytes
SHA-256: 6d7242372bf81cbfa8593ce249b6426678d2b5986cd4399d94d5e9a6f92c82c9