Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dca526fb4fe006e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 09:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 200d2d9a1d0244a170a0c6d55564fe7b SHA-1: 6a3fc42267feaa7d0b42dcd372a20c83389bb2e2 SHA-256: 8dca526fb4fe006e3dffbc72f5bf990161ba49d112c1c321ad62788193496312
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=puffin+browser+web+browser PDF link annotation
    • http://screen.by/images/file/boruvexiwiwujefidabosi.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/34852338235.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-14/20210914055932568642.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/gatorapab.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a81cc7474---puputur.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33cfbf40a---molonaxutegugisik.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/13640426315.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/madezimunavewapegubol.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/dolujajexosaxojutonekep.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/39361057406.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/noxibubabevogebe.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/kukuzala.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/52255222131.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/27301872268.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/bukot.pdfIn PDF document text
    • https://renault-service.com/userfiles/83889710123.pdfIn PDF document text
    • http://naviway.su/upload/files/95174629779.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/16573872541.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/lipuxo.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210914051024.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/fomajitadurapogaxowavem.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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10228 bytes
SHA-256: b3a7f6a9e53f88a78403d55b371866fb68e36b5c5e8f4af1b9c0fbe8b80eba5b
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 18076 bytes
SHA-256: 6cd97b259c4d5678f97d64eda3c305d9f736801adc5eb97e68fe8e5a48d0ddbc

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