Malicious PDF — malware analysis report

Static analysis result for SHA-256 5923a47ccdfb7dca…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 15:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a41a847af0d2d9a9a569ff60ddb70749 SHA-1: bd173d514d1166783d1dba8eed95978ee33b0032 SHA-256: 5923a47ccdfb7dcab9facc90e46ab18ea3754f9f435660b44ab082b03f221ee7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://jakpaisanestate.com/images/upload/files/fekoxapuxitusibijubom.pdf In PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/gebisaxekotepodojaparepov.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d3c22b4f---40096421718.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7408836b3d---68993080884.pdfIn PDF document text
    • https://zhansq.cn/upload/file/97950454927.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b11eaff4---34472035779.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4d53cc5123063bec1201c13455c6867e/76135691431.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2bdloq8rvgkd4tk5o7su1a9akk/64598995769.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/vujewajemabozal.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210629094947.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6513359fd1fd2c19220871dcbc4a62c1/xuvuletuvopifor.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r72mpaji9sijvvu2nhtm99avlj/zonutafetolozitagebipeka.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1dd2bd2b47---mumudadejefaziji.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b390c1de6c---319601683.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vuzebenamikiwuxagazum.pdfIn PDF document text
    • https://rosycaffe.com/file/47809845190.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978c096e7---bulatefinizujisewuboj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c43091eb---89607226281.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/sutilazesuderumapisalude.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/70053788008.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf395b59b---86358660107.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vewavelawutorixogiga.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/73729233906.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/terevuparufafajibutenoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=other+names+for+satanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 2716 bytes
SHA-256: 8c9beb229091da55b43da30d4cd02ae1af528862c87c1f72dae49f4f10bbfe0a
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 16728 bytes
SHA-256: 286ab1e3bd4e03dd3af92c2025c10f57377fcd29727de7f4e6fe7839a8a49f33
font_03_sfnt_off00014168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14168 10364 bytes
SHA-256: 2a2cb6d9992f61f70a0d3e2a50d144eb5609921d483adf5f2ddfb3c5ade3bf23

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