Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b679adfd5ec93d2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 19:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b4700ffeb491edf4c293c97a64d3f57 SHA-1: f7eb52c2e5d6018d453578a94dd8e1f6e849aaab SHA-256: 2b679adfd5ec93d23455cf1e0a1ca6eb6ed1dc3caf5fe1c2011d4595af52611a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary URL, https://ketchas.ru/uplcv?utm_term=wattpad+mod+download, indicates a potential lure related to software modification downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=wattpad+mod+download
    • http://reguitti-engineering.it/userfiles/files/33898035379.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/78671431023.pdf
    • http://richardchong.com/userfiles/files/36033870770.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/20559544228.pdf
    • http://sklepjola.pl/userfiles/file/kefome.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lukasuk.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff43512d6---59152516241.pdf
    • http://dianacb.cz/userfiles/file/kubetegolojapabepasimibej.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/fukoragefewebadob.pdf
    • https://shevtsov-art.com/uploads/files/walonameke.pdf
    • http://oembag.com/uploads/files/202109021203245862.pdf
    • http://everbeenmagnet.com/js/upfiles/files/11381584045.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/jepazapuriboxejesudabojig.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/50631636718.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b3efc3d---mulomobuwitoxuzobaju.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/23089605349.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ziwemusipik.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/21903809032.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db8b58348---48722413469.pdf
    • http://ibrahimalsada.com/pics/file/61894619717.pdf
    • http://hotstamping.pl/files/file/61835233249.pdf
    • http://dakhoanhanai.com/images/files/bumepa.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/rotete.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613418a9a68eb---79827869518.pdf
    • http://rovitek.com/userfiles/file/risogefezokaf.pdf
    • https://beamstraffic.com/amb/userfiles/file/siralatokenefa.pdf
    • 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_off0000c887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 16792 bytes
font_01_sfnt_off0000e099.bin
47357546fd623a0987d3349ab648c9ec9afafd298cf2511d70df75512b847a05
pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 16340 bytes
font_02_sfnt_off00010a81.bin
8dc32499a34b4e1b875cb78b89947ffd723db68439b93e5fb5658b5e5173830c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10140 bytes