Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae407e0eab4e1cf…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 20:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ac56ad9bec6386419f26f55cad7474b SHA-1: aee317c4c4cd1f41ab35ce57beb3dbfb603770b0 SHA-256: 1ae407e0eab4e1cf9c0f85003331991481a8e8c074b9127d3c76176ab3a2a5f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external resources, many of which are hosted on compromised websites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content, as confirmed by ClamAV detection and ML classification. The presence of multiple compromised CMS upload links suggests a distribution mechanism for further malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dentalweek.eu/userfiles/files/fasawuj.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/72f7tgunb2sj47sp3dvrm6ubso/makoxovajij.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/60825357774.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5f6ceb30---jilanavexefazi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/19778031335.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/kuwunoligogo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xovofob.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/retubirokapon.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jegupubedoxulabosi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/76144440942.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/dazovudomemaminipil.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/084253186b3a1ed4fa0fdf97064d9159/depikuluxuvax.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426ce2d8865---mitosivuzamomile.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/16195878443.pdfIn PDF document text
    • http://intersonik.eu/upload/files/57928253906.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/4519737388.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/satopesagutipuvotakiladef.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/nupekiputigeburosuwito.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/84379639705.pdfIn PDF document text
    • http://m2m2design.com/userfiles/mizumevudokewijusiwokem.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131444018f2d---tidax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mx+player+tv+firestickPDF 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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 10616 bytes
SHA-256: dbc30bde010ac17503eda76d5fe84651c421ec019e8cda29d0b6ffa4664456a4
font_01_sfnt_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 17004 bytes
SHA-256: 5523bcb621cc75cdf6deb08340957c36b4ecdd1c89044af5a78051898b8c7672