Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2cb64676743971…

MALICIOUS

PDF

81.4 KB Created: 2021-06-20 15:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2a9f9cc5d4017725a3371e8d0c420a17 SHA-1: 9be036e773ed87be144e60adc254897bca318820 SHA-256: 9b2cb64676743971829da100580f10b20be3b5b8331cec46a2b20dbded0a35f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was heavily truncated and unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://liniagdanskzydowo.pl/files/45670728032.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f1492f8---zibixamadibo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/jiseporipudazisamizisi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b7aa6feda026fe98a8cbde6c4b8fd59a/41553987995.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f990bc998b3d41eb0c8c8929b6f3f5d5/vumalobidujuxitorovukas.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215221711593277.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff903e1933---xetoxapixuv.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jvve642oncioq75bq3anv5lds4/kolakoxusidevemuv.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/019ef21b5269c9c719dcc518460f1fc0/pugidagenixopamek.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/jovevibubobisexamutuf.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uf772kgnv4ao1sp4r710j9rbi2/pufutijuvowijunidefivod.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dijalezogukemaze.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/tufumerini.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e17536b4---99756940148.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/94871753086.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6db77db7a---pidaxezovujatato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=black+panther+wallpaper+4k+for+androidPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 5356 bytes
SHA-256: d87fc801e348ae7914ece742b57b6255909eb9ae18db9917fbf09aa902241cb7
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 2456 bytes
SHA-256: 996669a32cd3582023f5c9d0bee76b3a60fd0c1118d5bc33d55580e7d7f126af
font_02_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 19348 bytes
SHA-256: 799d10b8697c5e3f3e99d1ba34fc6b7b9291617a191fe40131002e35e0fe49d7
font_03_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 16384 bytes
SHA-256: fb2ac63fb075d256b5587570191ecec806cb29c29da4ebedfc8653ce907d9040

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