Malicious PDF — malware analysis report

Static analysis result for SHA-256 234913617320acd9…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 23:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87819d47a5b6b9f1356da1ab49100eba SHA-1: af5b64187a1c3d8f4be033398d95dd1392d57b75 SHA-256: 234913617320acd901fc6f6130905ae82dcbe6a5be3500d5a79bd7df4517e382
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://smidgel.ru/uplcv?utm_term=10th+1st+lesson+question+answer
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5858a8fb---26487064477.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9be500a107fb901de93db06bdb5e3e7c/bedopegopuvuva.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0f118ef3---pajawujofodozebananek.pdf
    • https://webornate.com/viking1/uploads/files/kunugefikub.pdf
    • https://aksukartela.com/images_upload/files/vutuniniluvufoxu.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390375559c---85980225221.pdf
    • https://gites-les-bardots.com/userfiles/file/judepifekibawanoli.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1e7446116755dcf5abf6021fa12b0158/wameremazenulibur.pdf
    • http://www.emailposte.com/pictures/53086960942.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba845feeb62---85485409523.pdf
    • http://goldnumber.info/userfiles/file/85521200029.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f14e9dbb988ce329a9ddf834762e59fb/50048590999.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ed86c05c---gifibisigajiwi.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e793345d04beda1d64a4e7caa9567430/45224237131.pdf
    • https://leosservices.com/userfiles/file/26057906269.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60f366975---3688996714.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c52c2ee37---87936773015.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b1a33b97---gavumobo.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8a778fe6---69659828577.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ba030c08f4c2c4a8294b2631f58566d/mojosumagobofufakod.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v20hpbqokqvtorjjulsuotp0vd/dibuwiwo.pdf
    • https://serka.com/serka/upload/files/71569855043.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210712_EF2FC49D39075BF8.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071da7bd66d6---72653610775.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
font_01_sfnt_off0001009c.bin
5843ebec918de230cb55eff4f60600537cbbb1390620a08920ee6fb09770407b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 17024 bytes
font_02_sfnt_off00012c93.bin
b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 16232 bytes
font_03_sfnt_off0001421b.bin
7c4f1329a3de87e5e43a4edb44e981c7e669aab16dec9baed61d4e1a7ba886e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 10612 bytes

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