Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54a16a75b98e53c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 08:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 181f96424ddd42e66cb19bf1d069bd88 SHA-1: a0f77370ce56d84e54bff0bf60aef7238c5695eb SHA-256: d54a16a75b98e53c44218b9418ecb75b5327953fdc989a5053492ef204f79d05
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with numerous URLs pointing to external sites. Many of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garglob.ru/uplcv?utm_term=addition+with+regrouping+grade+2 PDF link annotation
    • http://progfin.pl/userfiles/file/40872341248.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/44569feb76cb68850924c75a43800ab2/89002833173.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/vozujerokumovinanifuwol.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/50735576665.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/719a0ec9e7e3919de2a13eef92bdd0f6/xegugobutu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609749226dd92---zatogefasofegikijifore.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/36426277541.pdfIn PDF document text
    • http://kgmda.com/upload/files/24194792176.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/19460196462.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c405a29bb7573ac50c48af8f6b200b73/59737498424.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7e896753---55657898343.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5830d84bc---dojoxowapiwufop.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/273flc3jak48pdj76cd45dk9qt/86619139122.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50fca6f6c---25209934549.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fecd8b780---gikub.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/30091071443.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/divelanixiratuk.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/mipufaz.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e89e4dde1---98965419145.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e934a436639---bifabuwofafonedigefile.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b51fa8e499---58132315614.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/bevomabisulovenixilagaxi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/84511649881.pdfIn 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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 17200 bytes
SHA-256: 360b050fbc906253123778d62524b86320d878f883145016f2e1cf1110b3fc7c
font_01_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 10744 bytes
SHA-256: cc1ea6a9a315779b90fb05ae60287f7a97524959afc5d659faebb32ac978544d

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