Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2623720f355ceb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 13:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78902ec2f087171c8dc52031a11019bd SHA-1: ad48a3584cabab7d787904b08a0f0f69665eab8a SHA-256: 4a2623720f355cebc407627f1a8cbcaa222b1fabc9506e032e2fca506732480e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://jyotiacademicpress.org/uploads/file/wimilasezeliwotabevukurux.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kifaruvew.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/45513910831.pdfIn PDF document text
    • http://gro-felix.si/uploads/bukolepuwuxepenobelom.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135027f885dd---tulovuwivikibaja.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/6209747599.pdfIn PDF document text
    • https://tsegypt.com/file/77704305672.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/579559237e91ca539e93cf15307d9939/kupakagelisonanosoduwixe.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fc10a80c8c30a2e055b4c42b79fdc446/wuloxew.pdfIn PDF document text
    • http://chinahongji.com/d/files/deruju.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2711eef9bfc61fd190cd722634d3a5be/kexuxifel.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/83563437781.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/wanugeradojomukalajorob.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/63558515083.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133a43cbaf04---11042195690.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/valedugasifoladadefewe.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/jadalowobok.pdfIn PDF document text
    • https://emenu.hu/editor_up/9848559554.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/sufopuwifelotapikagal.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/56207674245.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segapesi.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/wixunaxizawitepuruvuxa.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/83417165137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+v+bucks+generator+realPDF 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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 10688 bytes
SHA-256: f3a32ee3c77cf0d73fe8cd1bc64d443c6b2d8d8fcc40d07b84334c8f8f8d2cb4
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 18584 bytes
SHA-256: 9aa1620ad6bc4e96b50f7e6e1cb2a4f241882d9d16eabe7d9a21f6bd45bdacbb
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.