Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa38cb7b4f578bf3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 22:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 204ab95727a30eb5c59bbaa21d478274 SHA-1: 1b09461f11e1341bbb6d5f352d6b71dc0036d96f SHA-256: fa38cb7b4f578bf390b0aec10520b11150f472177b691fbc34a23bc2565068a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://lokalsport.no/userfiles/file/85805308185.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d19689a0f---xosebizunemononodudojoju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a61ea9455---78849163469.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/rawuzipevijamaninugex.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/68302677294.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35379313326.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/97490381928.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/28031346081.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d751b9ff---biluxe.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pizazaman.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/saxusa.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/timejavoke.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/zefabosigobiw.pdfIn PDF document text
    • https://edarky.net/data/file/5836269894.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84325404019.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/65369788822.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/83539582268.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/roperozuvuti.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fakebolasobi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b0658e7e60e34ae8def3f18bc478a781/rabapakizomobekolitidob.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/jolirelafibosavovodelugo.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/24893928537.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/demiwafapelare.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/vozitopa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3930221af8566bdead2693522652ec3d/25972107949.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/mixefawedugutevan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lord+shiva+live+wallpaperPDF 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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 10396 bytes
SHA-256: 119cb321d9e9d6eba7d600147913b363fba9a94a2ff946dfe1392a7b12ce0c9d
font_02_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 15744 bytes
SHA-256: f09cd5c4ec71b0e4905a5b2cc1f35836d813dfc5366c264da0571f7cbb043ca7

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