Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aa2d59a9c6c224…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 00:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 707a512208f71cfb9c07590a545ef1aa SHA-1: 115da68aeaf7527896514a389cb26ea32372afa3 SHA-256: 28aa2d59a9c6c22442d8e80ee931ed8aa587b90c4417d7d8b119eee16ca61246
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with multiple URLs pointing to potentially compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://safewatersolutions.in/ckfinder/userfiles/files/40951951005.pdf In PDF document text
    • http://esrafisek.com/images_upload/files/lovinenoro.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tozonexifuwopafasor.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/burudemafirowagowafurit.pdfIn PDF document text
    • https://beaszemin.com/files/33738804339.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161425ece95f3c---zodigulokepewamakivu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/24140215455.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zuriterurelerofitemax.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161424895a02fd---zukekaxemotik.pdfIn PDF document text
    • https://cakkue.com/contents/files/70270168676.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/21698234113.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/49379156875.pdfIn PDF document text
    • http://budropol.de/Upload/file/xazesazodudur.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/xuvufunifumitox.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/sovoweterodaxekonilone.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/konetewubulidotepot.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0256d49e7---ritagibotagamesopadovume.pdfIn PDF document text
    • https://botroul.be/uploads/dosuxelirapaxadibodu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090219564486.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aci8c1d4ci2gqkl29ouomhtj01/67146885430.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/16237623303.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/69004504703.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fenep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=snaptube+get+the+best+video+music+easy+fast+and+freePDF 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 11516 bytes
SHA-256: 259c2804d2e3865e7fbd00e00835b999bbe554a506ac2ad34898a18a3bf03467
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 17540 bytes
SHA-256: 4a7c068b2c4e52cdf02aba05ea0e5e2c52f3ab99c7ee9306391ace4269b870f4
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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