Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ac56f8d1355b33…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 17:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8344d831876fddb35e720dc0d08c305 SHA-1: cebf2060b6686b97e2725121ecf008d028d3cd06 SHA-256: d5ac56f8d1355b33e05609d78d521c7954accc07ce9c8773a9a3a76d02b89685
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and link distribution are characteristic of a malicious link farm designed to lure victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bioident.pl/photos_fck/file/87425819264.pdf In PDF document text
    • http://clubselectionvoyages.com/images/file/rovonejawesabevuver.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/fakopesuwadolisebamese.pdfIn PDF document text
    • http://schokozentrale.de/idata/93373219093.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/ginidorusofexazerur.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/90822485480.pdfIn PDF document text
    • https://menu2uplus.com/images/file/ruzimuti.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/murolukarirowevafuguxod.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa271e102b4---zosoberasikele.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9iiod76vgtds7k42qh6mjceca7/vupevomekigolit.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58e8a9712---71371265201.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f23e146542fef2524180a85569f1495f/66274978034.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/57250425838.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/a0jpj9gpisbsfg87452ij18r9e/15708795597.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98bf2b52bc---4360675538.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/welanutisapagimuwexe.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/07a9c841c1b9490cb726127a78abe57f/wexelixezawuva.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/89707037051.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6027e4f24dd0fe92417bd7a6e1b37314/melut.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc412e87b2---46777129379.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/08cccde469f470b47b2a0ad05033f5b1/22926797463.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3859de5fba7ee28e7aec7bccab410336/vugulemigopu.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wugat.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/14259144129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=and+can+it+be+that+i+should+gain+hymnPDF 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_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 17648 bytes
SHA-256: c3bf95d0d0cfd64cb8a77bfe1de4afef41721b01504a15375e66ac4662a766f9
font_01_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 11052 bytes
SHA-256: 49372e3f342072d9fc5863e95e4f24cd5fd84c4a3151bd8e6f28f8cc533bd5e1
font_02_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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