Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e4e30b515051ee…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 00:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d232f51291bd167d7d6dfd39c8056f7b SHA-1: 023d85f00c0f76baaf3d6f28cb93ffb26995c3c4 SHA-256: 90e4e30b515051ee6c427d5d7d781843e098ab6a2ddd29e5f99bfce5838a193d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, which is a common tactic for phishing or distributing further malware. The presence of external URIs and links to compromised CMS upload storage suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://alarouba.com/ckfinder/userfiles/files/7605468940.pdf In PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/h8vihtrgrok7mmul3lkhfv9443/jizajopifuwaxikixuvo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/54430174302.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f72032a86---51100749612.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/kexavegovupedalewajirofa.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/donip.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0d3335a5bcf6c1be8a894574e1833b63/suxatonufiwasokidadop.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/26ca3598de5e5aed852f79877006605d/ritaruboxile.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f18c72753d78cf73d16f8debefa94a44/97699701838.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7f3e4egfld6m6u1hhm1trbhrl8/jekaxeredafidilagav.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b8d59704c0703100d32e5c476cbdf619/19245191478.pdfIn PDF document text
    • http://markone-tools.com/upload/files/34212719403.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/arobdppb28tf25vr70a0v9nu41/53811874490.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/be195ed4aaa6e541bf1f1863eb1f2b1c/29625129466.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d1d07beb56c83bd5964f80355d03e63a/dufaviwis.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4hepg5o4vtcpb95u5q8rlv6211/tuwigigezagok.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/gotunasefugetivonizupavux.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e01fc9db7074589e015112b5feaefa54/42544730710.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55022018130.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/pimesolulutodimejap.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/nariwakiso.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513225842366829.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/bitowikilisuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=moons+toy+storePDF 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_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 17708 bytes
SHA-256: 2cc0598e8f7849df9bdc0277f03c3352da592031b8e8614348418e1ddb5cc5f7
font_01_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 9908 bytes
SHA-256: 2c32851627bdbdc309a3bd6413ea4409c174929d210e8badb70301455322f4cd
font_02_sfnt_off00013d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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