Malicious PDF — malware analysis report

Static analysis result for SHA-256 863d1e81abca5501…

MALICIOUS

PDF

96.0 KB Created: 2021-06-27 05:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f199997b9a384fe032265ea8867b9d8 SHA-1: dd256ebd4ae5b571f75b3ed55902b06553843ce3 SHA-256: 863d1e81abca55016c69a207354452b403bbd5976a69738aa43215795a1864dc
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable domains, likely intended to lure users into clicking malicious links. The presence of a 'Download Now' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/74c5d6fe66b00a6c1bd2999d0c298217/ruxanamafobumelefesurom.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/18b23fb02570da14a23a55d089ed7d49/fusuzo.pdf
    • http://nfraccon.org/userfiles/file/78383930374.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfddb164ac---91968813847.pdf
    • https://hgb.se/filer/file/92387129192.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6b72e8006d75d5196d1a814b3bae6167/94884087738.pdf
    • http://thedewakohchang.com/image/upload/File/2150957211.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9d2b4ea15---jejelenagonug.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72f012ea---35408048030.pdf
    • https://costabravas.com/uploads/localidades/files/lobedoliwidotinudowop.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/54701717544.pdf
    • http://mulroyenvironmental.ie/userfiles/file/19366494305.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082021d3f976---zizonajekolazuditejuwet.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e31c6a90---kuxubenawesitanomuxux.pdf
    • http://teplospectr.ru/images/files/fagevoraboxizu.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1e90da6498f24a0dcfadacae3940cc98/givijipeworox.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/bevusatodesutibowulino.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160776404cd801---91372515788.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c37ee39af40---tumozupep.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d32c1ef3---10840883478.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9bc8bbbf200cb0af420873002667906f/95349003107.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16240964484978.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdfelement+7+pro+for+mac+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb4.bin
d49475828c87331580bc70256e34a874f4433ecce55717ad4cc51d4bc80161f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10656 bytes
font_01_sfnt_off0001142c.bin
478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 1760 bytes
font_02_sfnt_off00011c83.bin
3daa01ded0d1eae71dd6e692749fb82f70648004bc5754f2945e0294d8ea2fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 23520 bytes
font_03_sfnt_off000157e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157E8 16792 bytes