Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9f8fcaca53bf49…

MALICIOUS

PDF

114.1 KB Created: 2021-08-14 12:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d1fd8c7a6e6744b68377e49f311f1299 SHA-1: ac02f244410f09f31de720cc6e2763206fa23118 SHA-256: 3a9f8fcaca53bf49abce52d9c038fda3027032e6cdcf9e7c566bcb78c14da272
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PRC/3D content and duplicate object bodies are common PDF obfuscation techniques. No scripts were extracted from this sample, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://crysiq.ru/uplcv?utm_term=c%C3%A1lculo+de+integrales+definidas+basicas+pdf PDF link annotation
    • http://bocghebinhduong.com/media/ftp/file/niwipu.pdfIn PDF document text
    • http://rinsacars.com/files/others/lufamebepisoxepuluna.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b75b425f538f10d5eab7dc8c0d14a143/65608198655.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wogodele.pdfIn PDF document text
    • https://noddy.nu/images/file/jolimepubimojirab.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/71f686241d66786f86eb52f26b7530f0/95740133040.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/65802827934.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/zumevozaz.pdfIn PDF document text
    • https://btegypt.com/file/65675155668.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750ffa3c716---18098188859.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wulikek.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/59545218550.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/lazowonujuzof.pdfIn PDF document text
    • https://lordoptika.hu/files/files/14977840226.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2f6f573eac14f51b8da6dab76a485e48/20958345191.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede25ed841---2284118072.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/de5e6d3cbe16892f985bd8f25d5f5b32/49668035971.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1b6up0v1a0jto0mh2s3v0jb5vs/21125045791.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a229925a5---71905648586.pdfIn PDF document text
    • http://unseretochter.ch/images/file/novagobokowid.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f45d0d8---zokedalilojazizuf.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/susunomixiji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 21312 bytes
SHA-256: f11608a6a77b0d59d5787a0b9c3e54b9fe70b40d22994b7adc3a2d0d68918f17
font_01_sfnt_off00016fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D3 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off00019d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D00 11248 bytes
SHA-256: 86af0416cccaeca1e57c16a6e48c54128564b3d2386046764a1084ff8beb5f63

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