Malicious PDF — malware analysis report

Static analysis result for SHA-256 314f1e0f0d89f79f…

MALICIOUS

PDF

73.3 KB Created: 2021-08-20 20:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 831b6f0c6c55eb5e6c67a1b2db177a57 SHA-1: 536ddf9c5759a21590d15a91e19b2ea5e93ad3f7 SHA-256: 314f1e0f0d89f79f88ec695ace77d14f8efa9c2f94ab95b4196aebd94794213e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://wastran.ru/uplcv?utm_term=grade+1+addition+kumon+math+workbooks PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161156905964dc---37386434894.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/dg7vsvq0d1s179vclan518rnua/42107166245.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/scagfiflata31jha5j4jk3f3kl/nalubikana.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/10434227871.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/rosozebujajisamepani.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/banawebenamanosofu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b292263138beb2e7560b94cba0586c2b/tuwutenudofivezivesakaji.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/1670249388.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b07534369---44607283914.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/57958713556.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/98761660778.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/31227839464.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d2bae0fa71ba4526c2e2e7a89a18f5f/69306666381.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/nj8194qoserukor3npm1cuoap2/19613704577.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce937364f7---kugutubonixamamujiputubaz.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/fepowijitipi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f866052bdd---56802010773.pdfIn PDF document text
    • http://sdds.be/userfiles/file/mukilolozorinog.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94662b146---17243209832.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/95603048077.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2659f7be---48241050649.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_off0000bc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 16396 bytes
SHA-256: d94c48ad343540db01177d4a1a926390aaf107e2441ad8a41955faee59d01b80
font_01_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10976 bytes
SHA-256: b3308a530eb80d04e8c8448e926df11f868762ae8ae0798fe21ca883c293e6fa

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