Malicious PDF — malware analysis report

Static analysis result for SHA-256 1254e4dc3e98cbc8…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 03:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 13b666c82f06fd82cc3a926789dc16ab SHA-1: 5fea02b8faa6273acbb708a5f06ed0129bcb8172 SHA-256: 1254e4dc3e98cbc8a56decf9e55b14884469a0713b68d4db9fca384e6f3e1062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used to redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+long+can+you+store+cooked+salmon PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/70448533595.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/43475154408.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/mezomawipi.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/62630190304.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/1090075679.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400825aa198---sinitebokikewi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16152d8482ddf1---57330694389.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/43456107412.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zuvojitonesefududujisum.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/jekutatukuvosexis.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/fexeped.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155905bb6262---1968443002.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/goferuwafonifubeba.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/73962259635.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/babugefuxamomis.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/32691951356.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fujejajubuj.pdfIn PDF document text
    • https://haidangpc.com/contents/files/fibiwokapavarared.pdfIn PDF document text
    • https://akemi.ro/hirek/file/85059449220.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/73359205308.pdfIn PDF document text
    • https://halkum.rs/files/zilaf.pdfIn PDF document text
    • http://watch62.ru/files/files/74054894553.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148504572d78---58992223630.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/45915045624.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_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 11004 bytes
SHA-256: b65668c32c3f6a499db338d874f5f8dcc329a62abedc39608aa05365a4d0709a
font_01_sfnt_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 15600 bytes
SHA-256: 8b6baf6cfef4289e8e7a9740e466ed3feda5586de9342bb6f8a8aa8e62f7e471
font_02_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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