Malicious PDF — malware analysis report

Static analysis result for SHA-256 185d97237fa4fd97…

MALICIOUS

PDF

90.9 KB Created: 2021-07-02 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0105bf37d2cfb797e96d5170c04014e SHA-1: de7d04e8105760a6fb42c6f199086543b6cb029e SHA-256: 185d97237fa4fd971b2be23cfac7e05e0e89c7d0c64b4da2dfd65bf9c2c454ca
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious files. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the document, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23127199c8---40826606216.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3955e4a0b3d1552f58cad62ed0650b48/juratamupedaf.pdf
    • https://menu2uplus.com/images/file/63435168463.pdf
    • https://resonanceacteurs.nl/userfiles/file/betinemoxiromedoboroxiwud.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae2532acc---89297723230.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81efcd32f---65129413704.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b807cbaf7d---tozebuzuxu.pdf
    • https://rivaflo-south.in/userfiles/files/17928497021.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a98323b8891---97469696139.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f24d777c4---bigawixerujedi.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ecfe1cc31---33578492268.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7692adda7---kizizexijema.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a6265d175a163c938bb75afc09f6e115/pezamala.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/85594262d120ec977d8952ed67dd43d6/8571301626.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b860f953895---78297801380.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d07d7cf0758e3a1c5628325254b480d2/64976497792.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7618d021---vaxedivozisufipuz.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8b822fcb10d1368258724eac01aa82cd/22449022304.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8ab633e5700e2891bda2f8039b3bf91b/jiwumigabevelu.pdf
    • http://jtour.vn/userfiles/file/mavezaripelaketut.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e711e05ce98ed0ddb196c3412d402eb6/66478503344.pdf
    • http://marinapogon.pl/upload/file/37653034862.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ebedeaac---95741585604.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c4be3db9b---beveludamejijasal.pdf
    • http://kapelski.pl/userfiles/file/tixufuzumojuwuduv.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d46742838c---48475081261.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+game+scooby+doo+pc
    • 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_off0000fc65.bin
b73c758f00ea9339ca780b1427e77589629b51a87406bd6a0e72b5c672a7ca72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 10908 bytes
font_01_sfnt_off00011549.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 16792 bytes
font_02_sfnt_off00012d5b.bin
674c93d621851a1747ce2aebc82b35d794ec22f7ab22324d831aad3c92eebca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 19292 bytes

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