Malicious PDF — malware analysis report

Static analysis result for SHA-256 04990a590b352ff7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 05:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4241323093dc849ab92469fdfaedf809 SHA-1: f09f92c0775f31fee233529f0a17bd9ce9884258 SHA-256: 04990a590b352ff7cdf8368a45735527d228a99eef1bdbc9a9c6b84f4a0b2089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to download a 'minecraft premium apk'. Several heuristics indicate this is a link farm on compromised CMS sites, and the ML classifier strongly flagged it as malicious. While no scripts were directly extracted, the presence of numerous URLs pointing to potentially malicious content suggests an attempt to deliver a secondary payload, likely a phishing lure or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.hkfew.org.hk/ckfinder/userfiles/files/jekud.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8l0ff7mi0cdvkehkbq9gqlb4s3/29391768369.pdf
    • http://onroerendgoedindex.nl/images/uploads/mamufoxuris.pdf
    • http://lulanjina.net/upload/files/sowikajekoteku.pdf
    • http://bnblspecialities.com/userfiles/files/zemurajupiwezikovumav.pdf
    • http://orkoien.com/userfiles/files/40945003321.pdf
    • http://schokoladenfontaene.de/idata/78866197347.pdf
    • http://linkingpeople.info/userfiles/file/74372966602.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141193a14972---33899280047.pdf
    • http://turksebruiloften.nl/userfiles/file/55238514634.pdf
    • http://12shio5.com/contents/files/16832704930.pdf
    • http://beauty214.com/uploads/files/202109132018205762.pdf
    • http://www.examnotice.in/uploads/files/93404371838.pdf
    • http://shiny-baby.com/fileimage/file/napisumusi.pdf
    • http://fratellibeninca.com/images/file/roxetutuga.pdf
    • http://delve-cr.com/uploads/bopave.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3749ff05---19983599196.pdf
    • http://limeitec.com/upfiles/editor/files/jidivopigugakividibiru.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/88419f2fc1ecd4ea56c9ce4e6665b2c0/78301732009.pdf
    • http://deaprogettazioni.it/userfiles/files/68196670425.pdf
    • http://sprinter-lab.ru/content/File/43198335569.pdf
    • http://cgl.lu/userfiles/files/46500729426.pdf
    • http://iccarrentals.com/files/file/9356782353.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+premium+apk+download
    • 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_off0000b0f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 16792 bytes
font_01_sfnt_off0000c908.bin
2d89b8de92a77f217d25a479fe888abc71e2b832d2984ec20da2c4b244c0886b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 10884 bytes
font_02_sfnt_off0000e23b.bin
00c01cdfdaeeb0e5101585bcf27ddafcd11979be4e018e4205b038ce7e000269		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 14812 bytes

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