Malicious PDF — malware analysis report

Static analysis result for SHA-256 2534b9b504a633e5…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 07:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 63eb0095a747a4f25a6b952d8e8e653f SHA-1: a2a4af58298d7e3d8077f6ce629e75642ae9f1d4 SHA-256: 2534b9b504a633e508da7e0891081556634f58b6765c7eac176c6a7790907f8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://synerhu.ru/uplcv?utm_term=oxford+english+grammar+pdf+free+download PDF link annotation
    • https://smartcirclegroup.com/userfiles/file/zedorigow.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/91187252817.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614219bb48190---67646684478.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/podujadejevubufovemu.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/39052042579.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/degigevabelub.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fb045282---25029318244.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/difoj.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/xojuwuvasisenafowujakan.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/89052015326.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/36372386645.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/81695279938.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b5a541161b---nusutajimevefewo.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/92932831097.pdfIn PDF document text
    • https://led7.ru/file/88544875327.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e499575f5---datisirope.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/pakosorititasamoluwu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/pebolurapusiporez.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/27735129849.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sodavagikukenazuwupapug.pdfIn PDF document text
    • http://cwesp.biz/upload/file/97349189261.pdfIn PDF document text
    • http://ilkemymm.com/image/files/ludokodetu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/12051056975.pdfIn PDF document text
    • http://salt17.com/userfiles/files/49266788764.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/50122738520.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_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 11060 bytes
SHA-256: 6d2439ec7f0bdbeba0fac2d4dbd7887a97233524f575ba20d13a9d562bd7f01f
font_01_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 18984 bytes
SHA-256: c630da596cd06edfc6d557264e6fd11dc27b3dabe792511018207e4983b2535a
font_02_sfnt_off00014d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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