Malicious PDF — malware analysis report

Static analysis result for SHA-256 0993adf9f8ec9159…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 03:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 790b2390078b9ac006ef0b7137519dd0 SHA-1: 814b93666d804edeb88f9898755a403116df4682 SHA-256: 0993adf9f8ec9159b8c66a3884859c4523d6c4835146c7e4f1e0076bedf8ddbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/poborogedasa.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e831696fbc---dagofepizamexib.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/xonufijuwefog.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/jasenibefazudorup.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/51081973920.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/57165673209.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/tanaponomajol.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/kogamitenixoxoruvof.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/43081672313.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/gapotudof.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/kisuxovixagiz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315d2657017---talikibakumupe.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/54474792504.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/luxopotegun.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/radiruk.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/86275413802.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d32588fb---60704259608.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/7302272861.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/zugaj.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/4326891347.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wujofezipapowoxapaja.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/60467429635.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b31a2c70---retiwukesaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=5th+std+maths+bookPDF 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_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 10308 bytes
SHA-256: f537467bc53e5aa59ad5ebe94db2b75af64b8973cbeeaebfe71552d49f9200b4
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 19180 bytes
SHA-256: e20c557cddb16722f9cec5fa2072f450032a3617185ecb3053ff1647e826ad7b

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