Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f69b94d55180f02…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d01510ceb9718f0bafa1af6d9a072caf SHA-1: e6b71a4864ca27e3091942e2c9713c82d175ffdb SHA-256: 4f69b94d55180f02c39d6324a122351bb88a074167cd8fa1459bb87b9a9c2cbb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various compromised websites. The presence of a 'Password-protected archive handoff' heuristic indicates that the document likely attempts to trick the user into downloading an encrypted archive, which would require a password provided separately. This is a common tactic to bypass gateway security scanning. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://global-leasing-management.com/uf/file/ripozubaruzerapi.pdf In PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/60699174173.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210908174801.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/jikuluwosemol.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/9728339918.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/xomepef.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/tiden.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/81218596970.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/59088227195.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091013061116.pdfIn PDF document text
    • https://gulamanis.com/contents/files/zeketovurokotalajixe.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/161b508b8a9a0af8ac1542a039632d08/2109568069.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/tosapokugurew.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/48222919071.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/rawajabitunufelodebagor.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137660bc9b0f---sezipateromomuwa.pdfIn PDF document text
    • http://marymo.ru/uploads/files/kapujotiwenu.pdfIn PDF document text
    • http://shophouse.info/images/files/pedelabivux.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kuvuxasef.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/79647160360.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bmhgo7g1gv8anuuvlm54su88uf/jezonukuzumininovi.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/78836557275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=adult+blocker+for+androidPDF 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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 10612 bytes
SHA-256: 1080ec49d054a7ac59bda04a43e62024a3ff61eeaf286c602b07b288484fd4bf
font_02_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 19180 bytes
SHA-256: 9beabae9844946e83a75d382992f4cdb3fcc44a6672372e3448b60d749ed0111

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