Malicious PDF — malware analysis report

Static analysis result for SHA-256 a970c64bebc238df…

MALICIOUS

PDF

85.3 KB Created: 2021-08-15 09:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63668505d69d5c9045edd44e6255e4c0 SHA-1: 08c4b70e2c1c45541d859e3dff12a32f7fd1c05e SHA-256: a970c64bebc238df9dcba497702badebc6b00d9814008cac3b7fff45e8ae01d0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e06003e98---65780628706.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2beed935---6425329744.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/mexuzonevatilororosopiv.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df6fbb8eafb---91343130326.pdfIn PDF document text
    • http://nktrading.qa/file/files/96447399568.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f4aa2fbb3---kipale.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/mudetizedutomisegisotukuv.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/5111481520.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/e3tg78chm93v2pumjeevr6aet2/jodediganagomivija.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/gojuvupitivuso.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a574ed52cba---23096808039.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4fb6b8107030ca28d6a9190b1b64d772/74468198714.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/46903538534.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/11702088260.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608785bf95e06---xumoxuzumo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8baa08433c---58611547606.pdfIn PDF document text
    • https://koratspring.com/upload/file/836135445.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/58614743322.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d47cd461---jolujowuzufotoduzetiluv.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/gitofifofagikujuvitukusax.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609659f2785b7---63932790557.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b7ce2d0f0---91945996044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kahoot+hack+auto+answer+bot+unblockedPDF 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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 17876 bytes
SHA-256: 690672c012258125f6f3585a5fc0049294d06c11153a5c7fabb9f1ea1f291c8f
font_01_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 10784 bytes
SHA-256: b4542423177ce9a469d32db1d7f9b7b8045f4a53813ac123f68cfeef92d85d7c
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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