Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a74e2fac302f9ab…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 09:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a29ae652f665d0333d2b4ed8e55d3931 SHA-1: cd35d3ea59969de5b02f0b6b94c6b1251abc9ac4 SHA-256: 9a74e2fac302f9abab6bb44a93e7c5e3bd33ee550f7268bf6171ee4052885bd9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://digbijoynath.in/uploads/userfiles/files/ladagu.pdf In PDF document text
    • http://taiwangallant.com/uploads/files/202109052237294425.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/bepofulabimokaju.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kosakafaje.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210903_065632.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/maweniwukugifi.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/29470362095.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/dawomujobazedagadafodo.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/rigifedipo.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/37733126974.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161448779bd2aa---98879583863.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443adc89805---90598103583.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/bafasubizuwane.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/4180634049.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/69020576048.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/97758177633.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/9823294514.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jadizubute.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/zajofuvumupiruxonupekob.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/pojunar.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/74748779934.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/497350327.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/64132240137.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd264b0958---59112959270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unlock+a+phone+with+a+forgotten+patternPDF 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_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 17416 bytes
SHA-256: 571dedce13ee8972fc1dda336d6cc9b40e5f6385b0d4115f068881660e97686e
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 10860 bytes
SHA-256: 27028110b072bd1e3e893944a49ba0f4677032d5b0f82bfa79dad3740c9b688b

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