Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f3873231f7fcb2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 00:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e55b33cf9f4272844891932c7637eca SHA-1: c66435b1e920ee7535c305cc68f9501f6ada8e47 SHA-256: 31f3873231f7fcb2b08827ecd2a3b492f147b3a4f67ddb97194a01772a6eb01e
156 Risk Score

Malware Insights

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

This PDF file contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to malicious websites. Several of these links point to compromised WordPress upload storage, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=download+real+steel+world+robot+boxing+mod+apk PDF link annotation
    • http://heimundsicherheit.de/userfiles/file/levifos.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/fasuborasa.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/89451305566.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/zelulo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/onlntbjdbf64fpisf29sj1v3j6/nudideguzetemalofomonu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c7312fd2318659362c984fb0e75ba241/vemetepurotemufoxewiri.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbf11daeb---57151146809.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e257d4608---vetevulukusawoleto.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_002705_156.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xiwejuborubuwusip.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161438ac0e6a05---7116659891.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/36570366120.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/12829916017.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/89996254093.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/foligalepabise.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/17927295573.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060954536590.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da7021dfc---zedasogudetesero.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/dasodaparu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/88685088287.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/gifofufet.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/34973896938.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/52421124087.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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 17552 bytes
SHA-256: ce7fc89e106bf450b65ce24e685479f27617590baec9ba6c21b4d9b1bd2b2886
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 11156 bytes
SHA-256: f6ab383d6d166ad08e3fd40203dbb8d0355cd8f5686af0e54256e49b7705bc99

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