Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590aec3d09b12c2…

MALICIOUS

PDF

199.6 KB Created: 2021-06-12 12:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 937d06a59dbf63946c7146dac67ce6ee SHA-1: c2cb9bd79f0258c51e94678dd70d1ca1a5c386c6 SHA-256: 5590aec3d09b12c20eb4aee0083d6f91bfc8a851f74694132472087db96575d7
294 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits multiple high-risk lures, including requests for recovery secrets and private keys, and a lure to paste clipboard content into a shell. It also contains numerous links to potentially compromised WordPress sites, suggesting it may be used to distribute further malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9232

Heuristics 10

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://medvor.ru/uplcv?utm_term=compress+pdf+mac+terminal PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0gbjc1l582nkv087p1s9tojjgb/45915188159.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d87837c---gekemopapap.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a3f401e51138ac76003b29ae7453eabf/17882954743.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/rudasi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5biqg8kv2h6ao6k1aqin1snav6/87672583145.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1d64fdc0f0838aac609ab65173043e83/jetobovanoretiwijazoz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/778ea8ea6e41ff1c73b28599ea1ed60d/merapidibesu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7039b94813---voxedosiworax.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bccba8adbd8---65303416328.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c827e30e3b---vafowuwosunafapabujuvakig.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/37715157553.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f1fedffdc8bfc8bf08f3f886dfbb5a8/40185206291.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086465f2a3b5---romegejuvetubojibim.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e711b535e---wetiwo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/69627537182.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074378363676---31054491103.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/69475383154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00029d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D34 4388 bytes
SHA-256: 99bcd950d93152af5207a4c1c8bc69c5cc7e94d94e8298caf44e10b0c462c1b6
font_01_sfnt_off0002ac9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC9C 5208 bytes
SHA-256: 6f38befbad9e90d21efc23f6d56201f9ed043e5bd22132141842e58390a19b9c
font_02_sfnt_off0002be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE2C 3884 bytes
SHA-256: 6bb2fa99cb12d346c45b66d2608d7cce87dc06652aa10e562ea02d2f2dec1803
font_03_sfnt_off0002cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD99 12656 bytes
SHA-256: ea488338871310c6c88b0788f00af5c6cab66b625fd62b13db2b1076f62ae4b9
font_04_sfnt_off0002f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F77A 16792 bytes
SHA-256: 9f31d55640e05aded10e2b8b0b17d0495f1b6c6219285b5dfb08d857f0ebeb2b

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