Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a6c2ee2dde0f31…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 21:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96ae362b8797155acf991042481947a9 SHA-1: f6b22a35b9c4b63f98a011cee73fcb765984b629 SHA-256: b7a6c2ee2dde0f313643f6a805c730d764be7081037cb7de29b8ec29b4b8be6e
156 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 compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://csc0898.com/userfiles/file/20210909180427_r1zge2.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/27d6f5c93d56763491702a03591ad73c/dapijadurisutamipigi.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/nujukibafa.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/jomuzojigibalo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/55821565484.pdfIn PDF document text
    • https://sitarasign.ir/data/file/82136696812.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jenadujomurotuboz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/12457959819.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446df0d612a---julivek.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/napefizadezepoxaxubomuwo.pdfIn PDF document text
    • https://emenu.hu/editor_up/gipitokuwaze.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/79521123858.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/pezuturitilexonofasi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15acd28a---bolulorareresuwujit.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/gemarililekabobabaxe.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/taxomezoxugobup.pdfIn PDF document text
    • https://ewt.cz/res/file/dokowidujom.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35eb80197---tirexokefewetulo.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/rujedilosubiwo.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75261403324.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613188a442a79---8452123302.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wufavotib.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/podivonur.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/mujelabikinunafumokafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+platinum+nds+rom+downloadPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 10832 bytes
SHA-256: c395dc163b50000550711987d07d2d11f790e88ec1f81beb34690c50f87f8dc6
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 17536 bytes
SHA-256: 1cd725e48f1881d39482ab07ef215c3d010ddbb644b13318a97100f4c26904f3

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