Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5a1025ecfba46c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-17 10:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba20a721ac295c1c9c66ce843c0b6670 SHA-1: b0ce02f4801f4e3dc9512c23ec0b177346e3a003 SHA-256: de5a1025ecfba46c64fecbabd7ebd0ff1f43479a343209cd4b9fbe8eb8c4f570
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The primary goal appears to be directing users to phishing or malware-hosting websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://crewmak.ru/uplcv?utm_term=convert+pdf+to+word+to+pdf+online PDF link annotation
    • http://woods-china.cn/ci2/userfiles/files/20210628064406.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e70c983656fa7fe32b480780a98d8781/pulep.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/497d1c2331ec5e63b02ff311e3696a83/6248066276.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/56459096391.pdfIn PDF document text
    • https://combrooncom.com/contents//files/87997579040.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/40793366395.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/jadakudejefid.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddefd4d7e8---80474010757.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069aed3d3e---namutamusate.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7877cd1075---refosopokenemu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zelovifugipel.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/titesunonadixanuraputuf.pdfIn PDF document text
    • https://everestart.com/images/stories/file/15805057675.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/3428087843.pdfIn PDF document text
    • http://metallpress.ru/files/12060850272.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/danulusilubofabosi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c008cfe44fcc6acbef9d63efb63ad1d3/tugamolowelatibavokazemo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/41208438882.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609444f25397a---sexol.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/medenawo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070848363605---welogulozo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/86480105495.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/80714060191.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/12368188742.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedb937890---33664905968.pdfIn PDF document text
    • 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_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 17060 bytes
SHA-256: 52889527a1a484d55ae48f6f1e00efaf77bc1ba7240b41e45a329bc3d3e70deb
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 10344 bytes
SHA-256: 77668dbadfc45f0bb6f2d3c315c2b8a58c2ccbb004537b82bc68a7b8adbbb290

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