Malicious PDF — malware analysis report

Static analysis result for SHA-256 e861edbaaf75a284…

MALICIOUS

PDF

92.7 KB Created: 2021-09-01 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 53a36e1c8b2126d80929ae3d40156f99 SHA-1: 8c7de45388299e418e787eb729a6da9df4a6c59f SHA-256: e861edbaaf75a284afe5c72791c88c2d2870a9e100a411972d62b7890921d7c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised WordPress upload storage. The presence of these links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bjhtdszdh.com/v15/Upload/file/2021713425209315.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fd49ec5c---33446468068.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/98644653454.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/jurupexomememewisaxi.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/56750567317.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/34228457040.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9184a03---59755135968.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/pituvazojexadetiko.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4390c0a4748238fe063be58064c5078d/fejemotofixaxoxa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jifuzujunovepewu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/lawowosezogozikeranisafo.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/23206466835.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/banuvejove.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/mixuw.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3u32aqgdqs13v01use8mhhps07/34783187838.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3846a8dd5---66084506922.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/1537120593.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607290fb3f83d---jufowugidufadux.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/lutomitidupe.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/43192712342.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dec7c13ed13---13270421239.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609199ecc4af3---vapagakiduvenonagizisew.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/93931834479.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210812124337_1015920766.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3498b706befa513cf977fd4e5c2e752a/72947551572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bible+verse+for+a+fathers+sacrificePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 10588 bytes
SHA-256: 904415b0fc7ae6fb471a76f789110bf5ebb03eafeb332caccfb6468bc5601d56
font_01_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 18656 bytes
SHA-256: ad0804ef9dac9696eb640390ea2a71986a2d7546e76457d49cdbccbc060b4645
font_02_sfnt_off00014cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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