Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ac66cb34d9c270…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 19:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed952375d278969a6dcc57e37933c0ed SHA-1: 7fd45547537b17381ce62b20653e4cc5bd0ca453 SHA-256: 91ac66cb34d9c270ea0dce1fff09ffd3564e3f1a65b8d721f851c9d2746407b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=last+days+lovers+of+self
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/eba1ba49de03347866e88c8c9157e77c/99723412038.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8712c72b24---22297227260.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/66acae7d19618b6f40f36a48640d5f17/rokuzatavazez.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/sowujubamejive.pdf
    • http://toyteepee.com/uploadfiles/file/2105180056134086406wgiik.pdf
    • http://andlupa.com/userfiles/file/zugapazutetiradepekivevup.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f09739b0d03e4ecd8d1d90a52129a542/15672096561.pdf
    • https://ka-base.no/images_students/files/53513670956.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b268ac9af7b---zomuzosorik.pdf
    • http://huntland.hu/upload/file/36217226880.pdf
    • http://abimobiliare.pl/pliki/File/nuxepufakomufexekapavu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e010182e70eb133fbbff5d40d180821d/vagovuwidivarivabi.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/37c5b23e846b5e938a6c9528d122dff2/2352940657.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d37160459125e2ae89c4a0f24ccc407/juzomulegimunesurolifoval.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/xanavuxilatobolajamoxul.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2ab76572179ec79aa990f90233ef8ce2/nolowukoxaworedupamaj.pdf
    • http://deurenhanger.nl/userfiles/file/48696908347.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc8106c63---23785954424.pdf
    • http://bioscipublisher.com/files/upfiles/file/32113425069.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fca378e5---kemijilawowurijib.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4d9ob7dgrrs16t0nshfvf4fl3u/20874823091.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e87ifnie4abc59qffso3c3shck/65995343736.pdf
    • https://isleo.com/i_photos/file/volukusunom.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/u8e0ckpf00cejqmckogu7oa7kq/94261625777.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2357bb638ad425b90a508db57b5697c1/34639160926.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_off0000fa3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16792 bytes
font_01_sfnt_off0001124c.bin
4fcb9c2ed2f07c95d40eea5875ec1381e658780df35b6c20398979f0c04f59aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 17792 bytes
font_02_sfnt_off000140c5.bin
65ba7891935000f8af88439f9421d8e1ca0782fbdfa501a46028e37a53d432c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 10288 bytes