Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b0697c3e38d7ee…

MALICIOUS

PDF

98.1 KB Created: 2021-09-11 02:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 239ab617d4de6232dcb339fa443169f6 SHA-1: e0816560e06eff47cf171253ab3408959b785eee SHA-256: 84b0697c3e38d7ee0ddde93876ee0674005df35e824895c6c374080f837ebec0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery secrets or private keys. Multiple URLs point to compromised CMS uploads and link farms, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://fsreloading.com/userfiles/files/sugenabivokavekuxi.pdf In PDF document text
    • http://ji-tien.com/userfiles/file/88528383652.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394db305233---4399562975.pdfIn PDF document text
    • http://nemochem.cn/upload/files/gujovefutebipatel.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643483d284---wekevukofijuxeraworugupag.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/62900263945.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/zakusimurapaloroniletedu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t8cr2okmgs6s1lfdd25802nad7/47444760456.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/luvitirawunilafapazew.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/zabiredasipudeje.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/16205808064.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/82665655925.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/41361813419.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/150850628.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/8289889421.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/lutanedixewefijat.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315cf3aa90c---dazeboradokod.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c82444a0---64242411058.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/8908702403.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c095ca5---zokevozaj.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/66291713886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+update+checkerPDF 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_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001328d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328D 18440 bytes
SHA-256: b38188bb7a76b1e129e82ab98ffd133728b0f0cded25bae5dee56869a6efc279
font_02_sfnt_off000162ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162ED 10572 bytes
SHA-256: 3fb2f095e3b77bf1c0b0dea7ce7e5a027dda0cb8deeb93b6c306f266311461d2