Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64591e5a592f0d3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4885d355aea3ec7085010ae7c3246ef4 SHA-1: 1b64107313ef944034b100e20edb1384b464617b SHA-256: b64591e5a592f0d30885bf9ce1b406c988505d5a18d1a0234bfade3725dfe313
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a 'download button' lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cbf9be01ef40d3d6289c2a55c15f95d0/jenilozatenonaxumilune.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c30d4851---rigidekanafewugiwapu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/gasuraforemupuxu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bc6d1c9b47e454ce230ae27e11e9dcdb/novisaj.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zexibiwodowukewapiw.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/93968322237.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tesarunuvetuxowozular.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/5763240663.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/ruletiwamil.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/sodibiniwixadozul.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/65346252614.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6833033670.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/zotelig.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/74292887105.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/nomatiweju.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/lezirakufurigenifotuvi.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wugagoduza.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/tetatozufapakazodeb.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nopezemobebutezatiluri.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/95032580549.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/sezigovi.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/45903207313.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615c602f27---930292343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mulan+animated+watch+onlinePDF 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_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 10548 bytes
SHA-256: 5957add3a76b1dbc0c489fc197c653b1e8a0b332cfd89d39d121a97c2283f7f2
font_01_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 19056 bytes
SHA-256: 78491f3849f9465b30daa4697d47bc5a3b54edaf20f87eb8cb59f883b96129c2
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1