Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a50e64216bae6b…

MALICIOUS

PDF

108.0 KB Created: 2021-10-05 09:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 013bf1e941ed3a5af1c23deb4c4a9bf4 SHA-1: a0f85f9810ec34684b1f46f3bfd00605e77a84e7 SHA-256: 20a50e64216bae6bfb975639277b06dd70993cf119b0d5d2c583aac1bc2c0322
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://studiotecnicodama.it/userfiles/files/xobekoberuvavujasak.pdf In PDF document text
    • http://lnhaihui.com/userfiles/file/20210918224435_1856192583.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/pajugafovirudaxip.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/vurezejanow.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/mutipuzivivovipoj.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/juwatotadipuxiwuf.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/86358639531.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tokawenazotazag.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/20107682460.pdfIn PDF document text
    • http://trevorhannant.com/10888263446.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/pinudejetujereto.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/nomivemoxoxekosimegexed.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140260d9eae5---6398036148.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/25652565887.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb54ac63f5---papitokozukobekibomagew.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/72247172263.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/rifuravuraguxuvapokebek.pdfIn PDF document text
    • http://matras-devison.com/upload/file/84998012847.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977805e51c---10797423857.pdfIn PDF document text
    • http://net-work.cz/data/file/27554704540.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xopedez.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161531787bb8fb---86387547793.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/tunogilofukisakejax.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/gowidatis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=trig+function+equationPDF 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_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D5 10504 bytes
SHA-256: e8e8b6dac2ebfa7b7901e1ce0a001bbabf7103cdf9dd1f6d6d239e47a830b365
font_02_sfnt_off00016c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C94 20600 bytes
SHA-256: e33497883c2abf7ef972f2f3813037d608cdeec144bcdc6f2c61ad5530547d57

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