Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1981722d351b426…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 04:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63d30e52e4ea65e2a656a5130183299d SHA-1: f843380c3d5d0b20e7d51293f3b1f0bf0953aa2a SHA-256: e1981722d351b4268009215752e1e887bba876fdebbf1ad0758d8d018ca5752b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a primary purpose of directing users to external websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=after+collided+movie+online PDF link annotation
    • https://seedcambodia.org/htdocs/cljr/data/files/fibewabu.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/37997652722.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/86597812645.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/62889382616.pdfIn PDF document text
    • https://lesura.net/userfiles/file/44590529677.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/10567635232.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/78500716283.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613459a4b9b75---72492663544.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210906045257.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/zidotebana.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/lefedumijikepu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/wegusefosi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144df3930c1a---23121581776.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146bb916ab51---94393607761.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/23548529011.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/79216953632.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/19524633866.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/94447722956.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/46999788060.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/25475586867.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/juzijupefidibedeginu.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_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 10352 bytes
SHA-256: 985136ae16b0a831e56372eaf551a78e88f76082d61b23e4953c9c13194e9854
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 17424 bytes
SHA-256: e0ac19ad5ebc2fe56267f007f661ca26bd9dfb7fc3a0e84a0afe55a7157c4d58
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1