Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b71d6499c906f6…

MALICIOUS

PDF

91.7 KB Created: 2021-08-23 13:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57e85dc53856ac37e2c421b16471ce30 SHA-1: eb3c392f2c310d4de2e6393f17bd7e14c14e93e0 SHA-256: 15b71d6499c906f69c43ce73138e1a90ce2f9846d660ea5e732a396b9fd2e3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=thermal+physics+kittel+and+kroemer+pdf PDF link annotation
    • http://notariocprietoa.com/notaria/documentos/files/ramasozikofidivomivufeg.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f773cd6ed4a---navobutaxonir.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/19904609505.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56097b3ac---jevujeri.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/ginezupekukorisanixek.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/zaroxegowaruxazine.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/r00ps6bmoa2iqjsth77kvg03n6/85812342748.pdfIn PDF document text
    • http://scsytech.com/upload/files/86280766345.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/pujedalakebur.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/64770576228.pdfIn PDF document text
    • https://unitjaya.com/contents//files/40641781620.pdfIn PDF document text
    • http://gibisch.com/files/files/15199188050.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36cb0bcc8---97589459726.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/77911730511.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076260e8db86---4459027980.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/12129123739.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/343865a3d39b545357f65bef8618a002/nubadig.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/38479704643.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0f9191a28b52cb9d6ef273d027d41098/pejomezi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d688847e8c7---dafefago.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210818024718.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a491885218---fizokujagiwabepofebi.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/fuzitoxojamiwokafe.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78844249475.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f5799ab6217f0f9874c8cd542cad070/57057032020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 11056 bytes
SHA-256: 67c3b187b5458ac53756c03a03f4346335d81c0234bca7f8f819287ae1a6fb5d
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 19120 bytes
SHA-256: 8ea5ad227467beaa2c214a7986c143a03020142485e848877bd2e13c360df12b

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