Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1c7c675803dc15…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 18:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d6419553c3727b3fdc03c4104345bbe SHA-1: 077f8d60a9a396f0b99aee2b6ad9cb67a4e05dea SHA-256: eb1c7c675803dc1508c55cec7b9734ee32bdb94ce10301809b9fb1a701ae34bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4c3d5c9d---lozugizo.pdf
    • https://mimpishio2bet.net/contents/files/74284813627.pdf
    • https://itscebu.com/upload/file/20210907032814.pdf
    • http://pmke.cz/pictures/files/94687645486.pdf
    • http://miyagi.chi-kara.net/Upload/files/37589310149.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tlks6ajdv4t1ae8ukro0tlirc9/91200202960.pdf
    • https://bunianco.com/other_files/File/jakipagojoxezi.pdf
    • https://dottoridegregorio.it/public/file/wezeduwizarofeloj.pdf
    • http://bptramptour.pl/files/file/metazijutiwokexasij.pdf
    • http://pathtojanna.com/userfiles/files/11162563919.pdf
    • https://sim2007.com/files/regalikutawurakalideza.pdf
    • http://dailymaydemtien.com/userfiles/files/5312368284.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/dixefepizivura.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/roletowe.pdf
    • http://lammensfilip.be/uploads/files/bidobekare.pdf
    • https://vayamcs.com/content_files/files/89713612855.pdf
    • http://bunny888.com/ckfinder/userfiles/files/55919556100.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcbfea139---96612333994.pdf
    • http://www.nomorcantikjoss.com/file/gitivixatisexavofirenep.pdf
    • https://axlthailand.com/imagexx/files/53764972295.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/65726571897.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/47291618227.pdf
    • https://natyabio.com/uploadfiles/8146302743.pdf
    • https://nidi.mk/ckfinder/userfiles/files/nabonunijutomapiverapu.pdf
    • http://abwnickersonplaza.com/uploads/files/16781261481.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a2e21415---japumiruw.pdf
    • https://gornjastubica.hr/files/baluvurunenisobilutixurol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fallout+3+armour
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de84.bin
d549fff0bb3d5b08a016b514601b2108398e89e1402c65ca8b63093cec9ca1a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 18568 bytes
font_01_sfnt_off00010e48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 16792 bytes
font_02_sfnt_off0001265f.bin
6ddf1bfc46a9cd254e602adefbaae551a9766b72e62d40f8dc399ca3e09ac2f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 10020 bytes