Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac4efaa48cac5d…

MALICIOUS

PDF

120.3 KB Created: 2021-07-02 14:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02f59b5e8204c858ff03dc8fbe0ea1a5 SHA-1: ec4a825126927403b59a0ec9400844a58adfbaf6 SHA-256: a4ac4efaa48cac5dcaa95f15cc4a9f9f3ac2bd5d17a5e6b4a52ea25376d37884
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and numerous external links suggest an attempt to redirect the user to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://crysiq.ru/uplcv?utm_term=pepper+companion+planting+chart
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210522205417.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/98222843068.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078722e0ad25---62068840215.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9992390ef0---lunusotegov.pdf
    • https://fenixfalt.com/userfiles/file/geziwidajovunabegobox.pdf
    • https://activepymes.com/pub/file/13050418168.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65aa4aa61---49955519364.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3imu62bt4chkpgod925p7palk6/wifafurolunopefuxanu.pdf
    • http://diysmart.net/userfiles/file/37947351764.pdf
    • http://seabeachthailand.com/UserFiles/file/44814821387.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1759568e84f3e86fa5b7bf575189e26e/zizosumedunol.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/nifatagiwopaluvod.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4998d0da0---bomewoxijopenu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2861cece9---33908887371.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/drg58ip1h2gatj4gudiq55pum9/wepiva.pdf
    • http://trunglam.vn/uploads/userfiles/file/46277422338.pdf
    • http://seabeachthailand.com/UserFiles/file/nitavoganibep.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d862d94c1ee6d5fbb51ecd5fba2d3314/goxubedifixeje.pdf
    • http://www.cddfct.com/up_files/file/genolefuxopinab.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/kudufaxuwotogekopom.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c470d67e7cbb90a5de88b2754227cff7/wofavidedazexel.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7uelckcl4su0e5qq171eo4cmv4/42630058371.pdf
    • http://goodtraefarm.com/ckupload/files/fijadirogame.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f2938e49---tifuxizevutuzijemanabowu.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072814e13f7c---56956421986.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6095fca0fed8802a111a8c33f1861bd5/wugenijaguduzabufumitex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x172C7 16792 bytes
font_01_sfnt_off00018ad9.bin
d642609a8b5e6b6db5997c664289fba22f09af4b1c132a3b02788cd667854e18
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD9 19452 bytes
font_02_sfnt_off0001bb67.bin
803d7f9d32c4e473902796bb8c4c8775b6b45caad29f0603cca52efb2a73e081
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB67 10656 bytes