Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c3333af961e166…

MALICIOUS

PDF

77.3 KB Created: 2021-06-28 06:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 113fa243d346e63f2e489e52bdeb64bf SHA-1: b391da9ebb6cf7c927f0387f79dec7a94aa91bd5 SHA-256: 47c3333af961e166495afbb76157ac6fe62ff3ca9e94a357c86f31f774781b4a
156 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 phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akcjonariusz.com/UserFiles/file/31260725666.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/76078947234.pdf
    • http://i-dron.cz/data/file/34345904206.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/498b4dd37f709b349eae0724298bb204/85056245536.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/t37c32fidg2ksbtv9nc1cct81h/jokarixuxubepuzavaf.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9c22ab7c19108cccfd430ddbcec6cb64/wevenijobelamaxerexug.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/691c0fea3d3837b6835460f26107d504/tutor.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/85480f0406e0747fc5a6cb33d9de1f8c/48964575683.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/soxemamojinuteza.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8d057aec47123b036e4696dc207c703d/fafej.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lt2741lffpkhfu56afdvfp59b7/kipukod.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/muqbn2ct93jednlo6nne848ek9/32459891474.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5320a49d---gelum.pdf
    • https://alianzatours.com/imagenes/file/nagosuredija.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdfe7b496---pekewutumikijedawuximak.pdf
    • http://mikailang.net/userfiles/file/20210530224942_1958099624.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd6fca03f---91207399941.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cfac36150df9bb722970030ce972802b/wudoguzixamalaj.pdf
    • http://stolizstekla.ru/userfiles/file/80906791303.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3b7433e5---pifov.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c038c294d7---47825360019.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9d5c70d6---5674505888.pdf
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/virinewekew.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456250b48d---wofutimemorimigibogarodi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=less+confidence+meaning
    • 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_off0000c970.bin
5ae5e0c6863455419e8eba88201c71c4de07d74d31eaa65485e4ba1eb5f9eb9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 18084 bytes
font_01_sfnt_off0000f81a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 16792 bytes
font_02_sfnt_off00011031.bin
738b68f4777a6b258280646df86d32676d2d94ffba6117c41fc12687d7ee0903
pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 10532 bytes