Malicious PDF — malware analysis report

Static analysis result for SHA-256 143d442ec604333d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 06:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f35e431e2c839e1415ecc1753a9c2f82 SHA-1: 8a4fb00965963c18f4df1f207614d2a9b509e7f3 SHA-256: 143d442ec604333d51340d849e86e6139b41e1a0d0f58e87c556ab60911f26b4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are part of a link farm designed to obscure the ultimate destination, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://drafthe.ru/uplcv?utm_term=pixel+painters+texture+pack+download PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613389596741b---73515891903.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/tudovovixejitifesemob.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/47407497781.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8d98e6e4ce7f682c3cc35652f0eb8ac0/guparog.pdfIn PDF document text
    • http://orthodoxnews.us/file/tutefu.pdfIn PDF document text
    • http://gibisch.biz/files/files/88569653566.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d31b8d431---savulelalitisasop.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/mejaweratawume.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/82772685591.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909200017.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/lefirusixalovudolo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nudejigoxoxow.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/tuxivemaligutemuxaden.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139e981a2fdb---xugarigiberi.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/77206356637.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/39105041471.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/45614693147.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/51027734203.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/wawesopedajeze.pdfIn PDF document text
    • http://saint-party.com/media/file/84359473187.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d7284c557---78296126140.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/misofaberopu.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/lojomuwitunesapuxisivim.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/68623bca6012e2d40f804c0926ea5301/28097545683.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/lovomegowipubojasidekot.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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 16736 bytes
SHA-256: bb123c7d4f38613267f4b2ff19e86a044674af9903e1c1da93f9a27f8a5f426c
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 10888 bytes
SHA-256: 9ba136a535420888e3419a1b53f847d4238113fbe5f41835fcc0043336242cba