Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8798b14acffa1d…

MALICIOUS

PDF

85.2 KB Created: 2021-08-04 18:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb47db3b50452e877caac6dfdbb3fa92 SHA-1: a1a31556984fab1e1fbb84a45c7c007f0e1c85da SHA-256: 4b8798b14acffa1d5c229d0b6b94a9b561e35f18cac35a81b46bc482026ddf22
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://kroonzuivel.nl/ckfinder/userfiles/files/niwonamupufotamunukoze.pdf In PDF document text
    • https://haisanquangninh.org/data/dulieu/files/36564970244.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210515202653.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/54554612449.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6b39999a---runokazifet.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a7f4e2eb---xasurabaduzufox.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eec712328---menusim.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/72264241886.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/48553166482.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828c9aa5740---4410354770.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/nururaxu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jupanovudoxewozupagig.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/98153414686.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3a46d058---80252303997.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/gefuniniloxogij.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d025c5a0---84906914328.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/33596771841.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747fee36741---xabepolamolo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ea86cec0---dezosatoxinavovurabibaj.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/61996293085.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/55093638461.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432003a03f---delobomuxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rudolph+the+red+nosed+reindeer+violin+sheet+music+easyPDF 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_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 11104 bytes
SHA-256: de582af62bdaa337d62da53a58054cf6d9a4e69f9d498f4d656f83d0a9598a1d
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 17860 bytes
SHA-256: 911ba59ceae96b91e71d34bcbec7f8372d6c3a90d9db4a88afe503c235086c85

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