Malicious PDF — malware analysis report

Static analysis result for SHA-256 76044641775de2ff…

MALICIOUS

PDF

53.5 KB Created: 2021-09-28 23:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 718eff4c2bb7bdf70d5c1d411d55791e SHA-1: 29e4f2d8bd67e79ff9a712c85c71e39bc8da69c4 SHA-256: 76044641775de2ff23b6ada12d56bed3ae80704cb476ab5a9cbcd42ccae603e7
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm used for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8448

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://irlanc.ru/uplcv?utm_term=ouya+controller+android PDF link annotation
    • http://diagcorlifescience.com/attachment/file/84965865919.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce54cfd3---31686052360.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/98499c250461ddddc4e882ce99d81794/zufusuwesim.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/81717774900.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148018d0cb4b---javusajizituvadamatu.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/20099731164.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wunagixitibome.pdfIn PDF document text
    • http://ccadl.com/files/20210927024921.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/80045904521.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109271217235445.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/fewovewebususadobiluwi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0fbl06ut2avtp74thhea8hls9q/funugupotopimoxajozonorez.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/budegulel.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/xinajojazojeropebejofomug.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/buwutobejizawopazelad.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152756d08cd7---30839557158.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tivorivijerilema.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/bifepujiwazamopejidunode.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/32521462775.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/31354183583.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161502d3c12bd1---44160412997.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lanoladizevewuri.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/18757765018.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE73 15264 bytes
SHA-256: c6e5ca7eefe59bd16e4bca76f15dfa36a3af424fbe461bfc8a95338c787a049f

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