Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11df43c07d6f132…

MALICIOUS

PDF

89.6 KB Created: 2021-08-03 15:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bec2b9a7aec95948edc9f3ca037c65e SHA-1: 4c7a075c3999280df932abf168674ee00d2c15d8 SHA-256: d11df43c07d6f1329736d308e93fee9764397894588b0c824498d1eee2174f93
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also instruct users to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=cavalier+king+charles+spaniel+welpen+kaufen+nrw PDF link annotation
    • http://tryinvest.eu/userfiles/files/62337986840.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/74352108393.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/nup8nq191ka9fd3albv32f85pe/sibuvisedikedine.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/61319036301.pdfIn PDF document text
    • https://koratspring.com/upload/file/97398416750.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/44900518179.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b61c1d7f0---92686211950.pdfIn PDF document text
    • http://nature-revive.org/files/file/73798268606.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/kevosazibefakonuro.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pogusokumikujebiwuri.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb95a480---86571173688.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/vabilobepalusufotamakun.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55f12c65b---sevotoduravitodi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1611c7453---tawesetusibomezokoditoz.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f75f247235c04df0df7034bde76c25d1/kamiluzubelolivedo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/33331988528.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/takiziwodukegidazotadef.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xijefevitewimemijiberifek.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/nukupipuzemuf.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/15445233904.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fdd4c44a---bemolinetojozanewirusotox.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/ruzol.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/22432893310.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 10916 bytes
SHA-256: 20aff9d0153be9651c65f0a702dded8457851ed0bd3ab9e861d32b513ba0de13
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 18284 bytes
SHA-256: 138435f1c3d24a58a082d471fee0d85e8a077916495dadfb88a7a49f75d8cf18

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