Malicious PDF — malware analysis report

Static analysis result for SHA-256 f382bd489104f905…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 18:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c16d0c5c5b62c44317685a65b21bc8f SHA-1: cfada54176ea150ba57de316bf15602f98660c9e SHA-256: f382bd489104f9056bf69b4394c4c607a94da1d680a1cd32b807ec411d829cb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable. The embedded JavaScript is likely used to execute malicious actions or redirect the user to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/37468d373d3171f761222b720a20fe14/24591149951.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b409e80a---44439436448.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/gomipukigikumutotowa.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/48417553589.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/buvalufewotimev.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/93125647243.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/38169990951.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611396fb85be8---bitegodisakadupuzategez.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/30457519859.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/wogalonu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ef192fab---86644814697.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ddde471fb34225a1ffed0b5c3eaf73d5/94407180258.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41273211056.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/mugapurawek.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29065d4aa---fugumebegadogerakepa.pdfIn PDF document text
    • http://geose.ru/userfiles/file/13661001079.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/49311322322.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/labof.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/bopova.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160caa5c0ea086---42920493153.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jimekovopite.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e1ff80faf---62966163658.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/16900345430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hoodoo+voodoo+and+conjure+a+handbook+pdfPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 10832 bytes
SHA-256: e58122572ff5975cc19b38a9f8ad7bdaa05f7f642841ca910bd49130ff51bb3e
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 17648 bytes
SHA-256: 09c394793e18a632a4a08aa99cdb7bc93e6c411457b762dcac85e494bd0d5b1c
font_02_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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