Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9730044f9562de…

MALICIOUS

PDF

127.2 KB Created: 2021-07-24 20:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7e0140ff1a6bee93eca11e79d61ce08 SHA-1: 6c7b63f883776e940970383602c068f4f7bce659 SHA-256: 4f9730044f9562dea7f3b78fc3174732b4d022fffb4f25eec8062e332feaf712
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

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 http://phuocthuan.vn/images/pic/file/wajelenan.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3a12ad8c37428a11984773f2f222d9b0/gabamezasovopameju.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rh1679l2bpp0fi3m6sgt7uh4av/dewodugoputibubaj.pdf
    • http://duszek-lasu.pl/userfiles/file/fisobagegabok.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fee057e60---jufolebipupizafeko.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5f44384f2b70d0f4c5e1c9abacc309ec/80368138415.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c24c06f4---siwojusalusiwidalupif.pdf
    • http://www.77ice.com/upload/files/letowotamesexoj.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16082abb3875cc---vukukujaletukiludarix.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/93421910101.pdf
    • http://erex.hu/upload/file/fugizopokezatosuwowi.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/43206240019.pdf
    • http://bacsionline.net/userfiles/file/84753560244.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/30288669837.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaxixuzinuzepotefuge.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2ae773969---filikibad.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/05ef6p9svbmafuqmkcj1fdsb5b/13594821669.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/cade303f8a817bd9791dd8b19cc3ef6c/58572240956.pdf
    • https://canionglobal.com/FCKeditor/file/mamagenopidodanovaf.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/tasenikojilumopakepe.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pkk36ljh61e21vrk6elrbfib48/8564650230.pdf
    • https://cmsschoolkg.org/userfiles/file/mesejezaniwuwonedasosike.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c9f62efde---97713558771.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ibm+watson+brand+guidelines+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_off00018c2a.bin
76013635d5c011ff073c892f2994bb55684602a8e050252a70db63fc9a68e2e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2A 11120 bytes
font_01_sfnt_off0001a5bd.bin
49e9ffb4fafef1cb9be09992f1d652b8901cb3f9d186ef2f37638a152913d307
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5BD 18228 bytes
font_02_sfnt_off0001d5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5F2 16792 bytes