Malicious PDF — malware analysis report

Static analysis result for SHA-256 57090624c65e40eb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea5a4e418e8afcffa93b722517ee9676 SHA-1: e12564b042dce51ec98265ec8fc1a437f6fbe277 SHA-256: 57090624c65e40eb281125c7d5fca36ddad33343c83de161e25b7d8a0f026f91
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external websites, likely for phishing or malware distribution.

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 https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc1b2c9ce---bimusuzuwunaritupagev.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcda391a3---wuratekunubat.pdf
    • http://safetruck.gr/images/file/xagugurorifanusemafarad.pdf
    • http://studioguagnoni.it/userfiles/files/99587646425.pdf
    • https://ndmoyun.com/calisma2/files/uploads/wixamotos.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sq5dmepve1blv67e224u9g6li6/84167032279.pdf
    • https://btsis.com/upload/ckfinder/files/92974692917.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e985d3b705---89373568732.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/21926557532.pdf
    • http://ckud.handysociality.com/upload/files/57245716443.pdf
    • http://china-engine.net/ckfinder/userfiles/files/22092068804.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlpd1d9fgf9m4mpar94qs1g0tp/34328433691.pdf
    • http://seattleteriyaki3.com/uploads/files/wapeteb.pdf
    • http://budoprojekt.eu/obrazy/file/pexemuz.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3eed5401---zutubepawedofekajelenip.pdf
    • http://underbutter.cz/download/foto/17191811778.pdf
    • http://robwalker.net/fckupload/file/lexorimopul.pdf
    • http://www.pvvc.cz/files/72539505391.pdf
    • http://hnc2.com/userfiles/file/vijofubomuxasodixupun.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/98477942135.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/62487672378.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/koxix.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210911_012D5362189CF54A.pdf
    • http://mc-opony.pl/files/file/naletuvotifavoriwemunumop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=video+wallpaper+pc+windows+7
    • 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_off0000e06f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16792 bytes
font_01_sfnt_off0000f886.bin
0836658657e54f4c7ba4a8dc41a8c29ff7f223166e9bf48b3a9e960b271936f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10516 bytes
font_02_sfnt_off0001109d.bin
a5a4945b382f405f5131e16f079cfc0467d941576920ccfa6509f77f531cc51c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 18440 bytes