Malicious PDF — malware analysis report

Static analysis result for SHA-256 3345868ffc3fbb80…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 14:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a76f1e756a63e0ae5248983abeb4e1b SHA-1: f0ae779a431f3c9e8846f93d76081bdcbe7a94d7 SHA-256: 3345868ffc3fbb80b5357802063304e85ca4c5f82f889ceb821b4dd32c2f9624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catbasailing.com/upload/fck/file/68796588997.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cc477890461820bf4edb3277df0ebbfd/pufavubozem.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/16488416966.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/19528372892.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/22127791637.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/69387202743.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/48643128874.pdfIn PDF document text
    • http://portableandcool.com/files/files/zozifidanido.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/neziwarukej.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/kejixikanisurolozegax.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kuxuzigubapogewomonasak.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/76a2ecf8df8a6aec76b11298bfb095dd/kukanebofotan.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/viwamuzotumezubinokixiruj.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/xafuwevobepezodavazugo.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/zumuwolotipitesomaka.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78300330901.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/rutonovejovidebemim.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/gejutonizajib.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613983587b523---62243036353.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/77463686086.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff781e7fe4.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/57775582875.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904000104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bein+sport+hack+apkPDF link annotation
    • 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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 10568 bytes
SHA-256: 17cdac9909c94257cc40d84fe3808f95b34a10b84fbf74330f66dee22711d5db
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 18848 bytes
SHA-256: 2755dff8e3f0a444b39dbf01cb534083a8c7d1a054ec337463e457d6182a1ec4
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1