Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b0cacd1c108cc3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 19:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdc09ccd86fa9c78ac2a2192affa9236 SHA-1: 1750dd58fadd52ac65246270d674d2392c500433 SHA-256: a7b0cacd1c108cc335b786a3a48abd52708190bab483e4be5addd6aa66c18448
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. This pattern suggests the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=moral+education+grade+7+term+3+pdf PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210821_062420.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/55536148888.pdfIn PDF document text
    • http://baoveantam.org/upload/files/51685475707.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/poronazimuvaraziloxodux.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/26157641961.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/bozalefetujirax.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/46228269449.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/206a1184078b96ec0b7364c58f91194f/89261957616.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609629541599a---55076484017.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/69271251519.pdfIn PDF document text
    • http://servmed.net/userfiles/file/63397083974.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160800fdd91d98---14362040745.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/67659002611.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e94d802b43---kagagenosivojoboz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021053122425190.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fuvupavuba.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/rozudowedipub.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf4fedd37---13446872409.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e5a8185b---86601429212.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/ferajasol.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/15072008357.pdfIn PDF document text
    • http://vejwun.cz/images/zivazedivinurulowi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/72611231686.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_off0000c41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16640 bytes
SHA-256: 69a669b7db23fbc5279225d9e38cbcef7ed6b9d19bc453cdfe92c9f68aa478ca
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 11112 bytes
SHA-256: 63e1fef5942819ad58617be734e6adcbbec6ff5731aac3e343979dc96dd49036

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