Malicious PDF — malware analysis report

Static analysis result for SHA-256 171ea74ece2f8e6d…

MALICIOUS

PDF

81.1 KB Created: 2021-08-30 11:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 413112d3f889b42157bb79fd7bf4a49b SHA-1: 871a7d6d0dd922e0d4c1e613172e48e4d9dbdfc8 SHA-256: 171ea74ece2f8e6d6b8922b63689ee87a2db4aeeb341aca4f064bbc4edf1316a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 http://sl-light.ru/design/img/upload/file/panesakidoto.pdf In PDF document text
    • http://uco-kampen.com/media/files/7207582473.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/86556492727.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/linilika.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/s21nh95q5jqgmhdrul8paqofoe/6216659763.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/bofozi.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3f84c34a1293edf798dedc4283cb1ed0/koxixewoxosug.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/rozevanowilazefuz.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/58893600695.pdfIn PDF document text
    • http://goldmustang.com/files/files/demafa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3dde5208---5220130196.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/lakujodawetita.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/sijuroli.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c362d044195f8a91b8597bb858323ffa/12674159025.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0adc58da27d5c474a4f83165df698ece/sonidoxote.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bc6cd672f5a4000cba4e3e221e5ebdc6/58362999136.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89af03255---95333562742.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161076aa0df350---vosofotojogeloxofojodu.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/145603783160eff33a40626.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d17365176149df2eb19310789dea9b03/53421270188.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/87330800718.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/2739184667.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wotigetirased.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wooded+land+for+salePDF link annotation
    • 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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 10152 bytes
SHA-256: adbe19afd54d81a16464ff91a1ea0640a7b2a4f4fc86dac8b51890d3c16650ab
font_02_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 17008 bytes
SHA-256: 222dc20a56e37fb9922ea36b278166f105cf81cca8404500f464c80dfade190d

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