Malicious PDF — malware analysis report

Static analysis result for SHA-256 934a43f2409b6e59…

MALICIOUS

PDF

94.6 KB Created: 2021-07-03 14:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d320ef8d7c08a73b8e4f9751cc4691cd SHA-1: dc7d57543a6724d6c8d4a4a173b06b2a42bf5521 SHA-256: 934a43f2409b6e592db23a9f24591c64e25994b46d2508fd4ea2d5c80fcf6665
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://infrive.ru/uplcv?utm_term=why+did+the+toilet+paper+cross+the+road PDF link annotation
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/86e162fb26f226e93be0b4195f07ffee/filareto.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb455574b1811dd116c7f50765c2a249/73665362157.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///putoluzojoxotovanomobakix.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cfbba7988---31174667271.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/litesulizamurosamilifow.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18ace350c---rokajegesuk.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dibogefulutifaduxagapegap.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zozowoloma.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xepufu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/gtkv7s72ud8te2nkl29v2bjnv5/96890466214.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4d922f4e9---butokipilule.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/53b2b11ec3bac68d1b85811a050a9e0a/64029199845.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/63538796023.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081631222350---mezajutawasom.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb27f1514f---xonisipezavepexir.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/32e454084ac8b6424a80608cd73d889a/paridivimefobonuna.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6fe34b569d71f23d509157e827c7df4b/5969356758.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ac4c35f---refoxib.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/220f4212d314c73aaf145e36f9535bae/32450551902.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/wufogonevawumixel.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/penebunajebusora.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/79357061172.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/314d2f95b4c218b47382437c6b76ff77/jabofedugukexojiseso.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/748484bea1fc8e8a0442d213c6301c0e/73646693997.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160799ff28d0b4---57374344848.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 18296 bytes
SHA-256: c774d7cb945fabd7ab0528fc51ef9bef9b59d99bcb8521688ac3a84c3e525ac0
font_01_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 16504 bytes
SHA-256: 115b418de671664b2b2389805d710068f6007e4508dd5a97e03637cda0987e5d
font_03_sfnt_off000153e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E6 10616 bytes
SHA-256: f6b87972c8d1e0e5a2c87206e8ce0a75d96785f104ac0d4bfc65098c342db634

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