Malicious PDF — malware analysis report

Static analysis result for SHA-256 724a912f89d3bfd2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 07:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 553319f91e9c1c80129b240101ec04b1 SHA-1: 0bcb2d0fb5a3cb04d593755a11a6bacb98caf8de SHA-256: 724a912f89d3bfd294cec271b86f95b50071cedcc534dc3d02799efc9f7564ed
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a visual download button, suggesting it attempts to trick the user into executing a payload. The numerous external URLs, many hosted on compromised CMS platforms, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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://chcial.ru/uplcv?utm_term=south+park+fractured+but+whole+apk PDF link annotation
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/72362897599.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0af995bac91959d8ec97f8ea3622a8f7/sanonero.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xiwalumarer.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/30508873539.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169530f1b8---11637710858.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210909122729.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16139217674e39---98376890716.pdfIn PDF document text
    • http://philipsphotographystudio.com/64720163187.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/80012054442.pdfIn PDF document text
    • http://lblussana.it/images/file/filuxuxifukujo.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/zezezilafuwazuki.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/suwejifidogidikar.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/temelajawonamabitugaxoje.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109091418214655.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/wuvozatate.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d1f739f2---98406620757.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/nirobijarot.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/82812556162.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/47512694429.pdfIn PDF document text
    • http://dytac.hk/userfiles/zajaligamegebupe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136109986f42---49878026017.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338047dc56c---2187341240.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tomedumigipokodogarodol.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/75008584534.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/vomuganugidelutexamirasi.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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 17564 bytes
SHA-256: 6a3de7c465a28c637c03080c60cc7a31e7348b740a68607931428c3097cf7ac2
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10848 bytes
SHA-256: c697d280d2afd4d37325a6c720132e303a2a3261fdb9e75a16d0e807c4a0e9d0
font_02_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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