Malicious PDF — malware analysis report

Static analysis result for SHA-256 03746f66f07b4354…

MALICIOUS

PDF

79.9 KB Created: 2021-06-30 09:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5be4f74fb61c920378c02b924c93bf57 SHA-1: dc459c8be29c7a76e9a3ad4aa9e2f4c81909422d SHA-256: 03746f66f07b435475443b9363406eaed4042a653f6e487cdde9babea1053da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=this+is+bill+be+like+bill
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cadae04cc5a066cfa177a73bc98ffdc7/zijukajenonemade.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ug3mskc43joebkm423as8r2gm2/98969960819.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b46a7732c4a8e4b2962d3fe643ec31c5/xajikamuwunudikefosi.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb24f8c175---kegalefexajoxiwofi.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160768cc9bf6c7---xurukurakevafe.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091097303364---jikuxuzojojopuxevaxik.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c01376717---6840482575.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abed5c892cf---nasunuga.pdf
    • http://brmxn.com/userfiles/file/20210515001102_e6o0oy.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/99125813330.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8957caec652c0f13ea05d29f8948d70a/43559383562.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/df95b31e86949dc0a4c11ecb0c4db2c7/59733261181.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8ace8f36---fagadis.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/7939d8801e689cc0b20063765e3ce371/xakiwuvururalufipabanu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/221uerargn5769qt5no89i1ja8/jabasegoxovixumoruzenete.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ee8rn1omvo8374mfj48bfc769u/xatinira.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde4e4599b---xogiperixikemekiduve.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05bf38316---dikezikulox.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607103017b2e8---55172608735.pdf
    • http://digitalpolicycouncil.com/imagenes/file/18402468819.pdf
    • http://www.kymkarajok.net/tiedostot/files/91624980402.pdf
    • https://aduanaldelvalle.com/userfiles/file/medifix.pdf
    • http://thietbiotoviet.com/Images_upload/files/31331184391.pdf
    • http://mrbossamktown.com/uploads/files/jenubakinebanomiten.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_off0000d830.bin
8fa98dcce933958a59443d005353498943eaa0a9cedb2c3b91d0c83f339a7864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16988 bytes
font_01_sfnt_off00010484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16792 bytes
font_02_sfnt_off00011c9a.bin
0d62204145eb34117e66abc30d6527b393b87dd545f02e5a6fb14725e3e3c02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 9816 bytes

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