Malicious PDF — malware analysis report

Static analysis result for SHA-256 1851cdb0bf17b685…

MALICIOUS

PDF

73.8 KB Created: 2021-08-16 05:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a5d824cd52e1361d870b427d1e5d032c SHA-1: ac28c859b25d93f76e25fbe5cdc33414cdb9c6c8 SHA-256: 1851cdb0bf17b685e4351666027792bebe59d8cd570ce37e9270e4a47130464a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=dingbats+answers+level+230 PDF link annotation
    • http://polskienarty.pl/data/aktualnosci_imgs/file/41162254032.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/14249110473.pdfIn PDF document text
    • http://8njl.com/userfiles/files/tufosotonububenafokedureb.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210608_05F01BD9409FA613.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210626135424.pdfIn PDF document text
    • https://medtek.vn/storage/file/degiborugopotenesez.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/90680168323.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/koxames.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc08caabde---36580133504.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/nikifejino.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nudadajusebemomixo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df40998b59---26239027449.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/mefusivisuzurajofenut.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd546b3b73---23732076198.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/75cc746e8ce14a3cabecd29dc0aaac57/14625408227.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/54a9a266c7789f67c0fa2e244285c583/7149771969.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/tenokizar.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080468b13695---vibefirejojuwurijaga.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9585b32034---64155824163.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0856c6bf1---64341128060.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/icqjq3tmgqu9mpngb8rvfcilj7/serijowogenexigik.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfb0aa0cf0---suzasuvodonopad.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/51e62ba37353113cc923309f3e888779/10821562859.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/52aleorvj6td0mmarpa1606243/93423990923.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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 10872 bytes
SHA-256: dfc89b56ecca2faa8c9816a1e87c219944a4976177fdb3eabdf1a148225cf7ec
font_01_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 16356 bytes
SHA-256: e95206ef333eb99d5a3d0d51cb6350fe42b3b4f028f7c42e8f49e699d9bfd78e
font_02_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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