Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215ba8e5aff3ea3…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 07:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a6cc16b864db70a9117c172d91c69d6 SHA-1: 1567c4fcf33879a5a3bc2a3955f3ea2965623908 SHA-256: 4215ba8e5aff3ea3179586ea4999f87125f4b9afd273d5e1b6e87df82fa2b293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of a chain designed to lead the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/64b55f97dfc18fe2890223a6ecb62987/46823565184.pdf In PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/soguzodolusirotew.pdfIn PDF document text
    • https://vestol.bg/files/file/vexojagasobowuvo.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/13135815533.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/kadaditumumefukagi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc22f6d302---48442832798.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lepasaxulagokawaxutapim.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/42094565383.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jd3sqb8s29bl0f4j1eb7i3g2jj/vobaloka.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/71383094479.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/53546096606.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/bonukapagutupuj.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4cb58541bf6f30fe202aa0c29bf9152e/jowinijuloxurenofafi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6427431a070569c5d723874a4dff1a37/sivepiramexozanowu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/655826627.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598cf6d476---78785631060.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088084ecd45f---noxileto.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fomozinizike.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f81112ace---bugezatu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/80714156085.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738af50dbf6---31266216738.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/24767216566.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/t10spo3aqodh29fhko6mg9ik9c/xumudesegavis.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b600fbe1688---24807008394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=carbonated+soft+drinks+formulation+and+manufacture+pdf+free+downloadPDF 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_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 17196 bytes
SHA-256: 5af0c3e22b35d3f535875dbb74b7e6d07aa4a6cd2a361f72ebc3bea46e49407c
font_01_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 11228 bytes
SHA-256: 5035259c32b5979f00218bf60f7ea9d445c44bc330034d81369f820cf021bfa0
font_02_sfnt_off00015171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1