Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f004cca9e4f9c7c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-20 04:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98eb365327fb72eab9c294691705aeca SHA-1: e1fa4bb1086ae40c0139edac8a98520de109d5e8 SHA-256: 6f004cca9e4f9c7c25dfa982bc0942ab0230a1be6d8fcd5e60aa79b7b84e3ecf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=best+app+apk PDF link annotation
    • http://azseal.net/uploads/userfiles/file/reroxijedonanofobun.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/joderezowajobekoxirivak.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210911174800_1587717672.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/jagiraru.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/92899530387.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314e087ef74---gerenipo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/55563154783.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/84891637469.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee30a1198---laxigugimuxigumamasogi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3e2deeff3dd8669cee9822cb4a0347cc/zimeg.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/rapavugofivimufibajomuli.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/55397097741.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090522075487.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/36266802307.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/tagenozi.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/kewubuvesofomor.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-14/20210914102319402020.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/27342057842.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/govivof.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/4790232176.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210909_FCAD4AC4B1BA81B3.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336b8041b9d---51448984748.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/48235101542.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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 9928 bytes
SHA-256: 5aa95bad5c51a5734810d56eb8bbdbdac19b2c4d50d3308e152d52d4624de50e
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 18208 bytes
SHA-256: a50784fef276b7a10bd384e94904b428cff5e72cb7aa275490a0b5428b17fd33

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