Malicious PDF — malware analysis report

Static analysis result for SHA-256 7815aaa1974c9f51…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 10:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0581cd856df70d7e7e9a9cbad7dbfaf9 SHA-1: d598e694dd67b6f1c67c9d97a809d04d3cdf10d1 SHA-256: 7815aaa1974c9f515519a631aeac42c6b91e95d452e37eb84be49a04a4b85464
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts hosting PDF files suggests an attempt to evade detection and distribute malicious content. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bce31d605---85647511301.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c356b60e---sabuwesabefarubidav.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dhl2dp27ghm05re3lfih7ljian/fediriwafofugufoja.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/55c9bdc8f05329afe20656843c20445b/28847556659.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b9964c61---narexid.pdf
    • http://dailitara.lt/bites/uploads/file/28059230787.pdf
    • http://rallyteamwalraven.nl/file/32516438973.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ropubouotqg1nep8euevjt3dju/49493561198.pdf
    • http://terminsk.by/pics/files/34913125253.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/115f9a990e70cf5c36161ae16cd119bd/50527270022.pdf
    • http://mega.kz/media/upload/files/2223505225.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b18d22749---67124838181.pdf
    • https://cochleartudaskozpont.hufiles/96906060257.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bdfbb68fb---52680804244.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909405308fc---71630843231.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d4aab3eb2---42528352716.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/m3mhde1nmu0evlqvh44r60q4ko/67736710955.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/49eeed236072b7dc727e32f764226c7f/bunag.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/538b76f7ba7b6fbdb4d4d2825e856603/moxajetitozuvolofiw.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160828a5d1f60b---89232909576.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3e1427f6---23942201064.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c24acc27---16835817424.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bac1fd2b---kebesevopa.pdf
    • http://anpo.vn/upload/files/paxasobufi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=on+dividing+2272+and+875
    • 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_off0000df01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 16792 bytes
font_01_sfnt_off0000f718.bin
45a875144620c74d563488087ffc42cdac10e9098a064d87217487cb1af0aeed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10360 bytes
font_02_sfnt_off00010e9b.bin
939656cccd91d6bf3324784c7c6df8eb271ddd8b4eeb10f3ce965a4323c62980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 17404 bytes
font_03_sfnt_off00013b32.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 16088 bytes

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