Malicious PDF — malware analysis report

Static analysis result for SHA-256 9383d77e99d767f4…

MALICIOUS

PDF

83.9 KB Created: 2021-10-16 00:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c45dc2a2798924e7f5b57db97f876758 SHA-1: d71a3fba3e0f7eace05dca5a00192e8b600d6f8b SHA-256: 9383d77e99d767f4f23eff378c43584d99756ae66bdc830c03d51e7f9f5d39da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16159860ce5d02---68495421337.pdf In PDF document text
    • http://haki.vn/uploads/files/vadudiwiwuzabuv.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210919085216630.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/54030764206.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/10052507407.pdfIn PDF document text
    • http://scsytech.com/upload/files/54298222145.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/20156137405.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/49514046894.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/69152718274.pdfIn PDF document text
    • http://dajia1.com/upfiles/editor/files/95813095444.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c0e25978---lanubukisabenewugipedas.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/bijenadivudibitenumukus.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e08d8338b---xojewelaxegilamibix.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/niwaromatubinubuvuzomez.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rupisobepo.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/bevor.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/58218314781.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/98850832028.pdfIn PDF document text
    • http://3m18.com/images/editor/files/tepegufevuvudebomojos.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/famerijixakarojur.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140db149c37d---zazomovedutulerusevewaji.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/80368801828.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c086693fba---puxujov.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/boxebonakanijabapujafegol.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=exempt+from+tax+withholdingPDF 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_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 10948 bytes
SHA-256: 1f8359ee6f549321f095da693145bac26173d367890f54c7ccdc2286a9a8ea6a
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 17244 bytes
SHA-256: 208b2c96205db4c81cccb83f229cec2536ef6b0da90ebaf1ea530202d14b44ec
font_02_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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