Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f621e58690f7d08…

MALICIOUS

PDF

87.6 KB Created: 2021-06-18 00:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99a766bda3c65cc4d1dd332fa19b3f3a SHA-1: 4167d7a6991909851400a32bada48037fda6dc1f SHA-256: 1f621e58690f7d0801433807c1b9625f23e683400e963501867bac34d608c012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords like 'affidavit template zimbabwe' which aligns with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=affidavit+template+zimbabwe PDF link annotation
    • http://ampletrekking.com/userfiles/file/56227876741.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b129626b8---49014225062.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/40805354516.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/52319411188.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/l7rec5camekk4dbtlk52dpfr1h/tafukagererabopedukovi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ef08e8ce---sekewip.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/54b1799fa8e840bd88898037393cc53f/41900915350.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/36761342581.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c984ee33919---majugugezorukopexejimobip.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/forugunokuv.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5453c08a42217d9a8ff071f8e7f02b6e/52279617254.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a96672ee6ed---81497164298.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/169e03646a42800ba61779a293e99eb9/52188972298.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/022b0343f29589dd2741dbc2db9665a7/28878101726.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210507221955.pdfIn PDF document text
    • https://coil.hk/upload/files/27614010212.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4ee4ce37---79995938328.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk2jcantos8d7adteuff89hotq/23928413505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 5244 bytes
SHA-256: 81ef58105be19bee26ec62057f1b6aebbfd33629a5837db9e02f86a7cfcef15d
font_01_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10660 bytes
SHA-256: 5a5cffbb8e34e84e94d1920992594b27d5f12b5b912d3e95a1c4e0bd801ca3f0
font_02_sfnt_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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