Malicious PDF — malware analysis report

Static analysis result for SHA-256 2311be07319b25ea…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 22:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 803645f478fca8ead9dfec03b9052c61 SHA-1: 3ee4d755e1d787b65eedaed5485ca5dc638d5994 SHA-256: 2311be07319b25ea3ba71ef7856f19521f78dbc959fcda0f4b8d63b5ba0f22f2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=pdf+content+management+system PDF link annotation
    • http://madmojo.com/fckupload/file/gatuzadurunexoxapoxanoni.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/17516838683.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106c290ddbc6---4966638633.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/51218228710.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16116a6fe1a61f---23451699042.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/vojadumotojagoxamijap.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/17845144829.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/tamopifatavu.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/sifeg.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/cdc8ef19b254656662dfa7da3dc8b179/4524336273.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbffc843f---26476006491.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61b65d025---dugiranavojiw.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/wuwixujir.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/wofejowavimolo.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/kodusidagemorujiremazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d27eb754f---pojef.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/18228044912.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8kh8nl46tvi6971m4h60vhmnh2/sulerezafetadukegarusepo.pdfIn PDF document text
    • https://ckmandarin.com/uploads/sekosukusasagesoture.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9844db499e---paduwosaladutarufonuw.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/mugaxebozarev.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/kejugimupubumiw.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/5379056119.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648e90ed1e---gunetawiwelijoxe.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/35980707494.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10696 bytes
SHA-256: e3f59ee5b251c0d20a36e92498110c9d0b797701e2fda37f4f83de77dbdfbf24
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 17740 bytes
SHA-256: bf76362fa964f328ebbb196b937d825bc73bad74576439384844b4f7f83cf7ef
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.