Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ad37e9940cd61e…

MALICIOUS

PDF

76.9 KB Created: 2021-07-07 01:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7829fb2269ee02b1b22fd980eb736d8 SHA-1: b28aad0e15c01986c07d3865f6f9461ffafd0e32 SHA-256: b5ad37e9940cd61eb8fffd7e0af69f9c667d46c386a1343cdd8a727ccc63650d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or distribute further malware. No scripts were extracted, but the structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076266c93ecd---68539589831.pdf In PDF document text
    • https://wendi101.com/userfiles/file/10155067403.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/fexezalobozinegudovudoz.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6f7cd556f5236c77c0f632648f6c6352/lidubekararataza.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c5facff7---fokaxoleduwofamuzogo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef2836a1f---wutagavosefazo.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/63819247434.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/mimokuzogiguziwosu.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/teximivadanaxub.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/55639592901.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4bdf909daaf93632a6f4cb74b19b50f2/segisosibokofodewamar.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/riwexuletoviges.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/97168576107.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/73159262240.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/66270dlfksf52l9maumgmaaptn/fibejemosukerum.pdfIn PDF document text
    • http://mousike.it/img_ins/files/vaweno.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jtni3l1rhf7jf500c98cs6n9e2/38131276079.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5022d87d9---82584034892.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-4/20210704151354416420.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/86340962235.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/rijijekavovutepitutiv.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/sudoxotisixoge.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/11559825308.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/t96r6btvvasdle25ateempd1v5/54547452426.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jr4slrqgo3v65c1h445ck6s69a/55014788073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stand+up+guyPDF 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 10196 bytes
SHA-256: ab064e37fb91bf2c5e780216426c8618644cb31fbe056a4e128223040b07ea43
font_01_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 16376 bytes
SHA-256: 4427655f360caf5bb2de88591c1e7bbf0f241f72a33ac49ac4ba863217fa36ba