Malicious PDF — malware analysis report

Static analysis result for SHA-256 73116da7f923b750…

MALICIOUS

PDF

237.4 KB Created: 2021-07-08 04:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4fc4f7951a0965a051bae0a7e5678a9 SHA-1: 1a547108f0dd91acec469cf43b7774c63ee4e13d SHA-256: 73116da7f923b750cda3304d5f3e6f79fd7d446fdfd357e3bfea1d09e0dfa96d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or phish users. The presence of a lure to enable macros or editing further supports the malicious intent, likely to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=territory+management+meaning PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a760138c4ac---73681985503.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59328968250.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2a89824ef57a1e7a8be968216c6cad82/37636196628.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/20423905491.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ca8343990a255708a6a59e919bf21b5e/12797328646.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49a2dc6f0---7285378704.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/letonusazotena.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2q4di2g553jbjlpif2kdpim50c/94310387833.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4907904e6---7519059425.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/fd54234dd5f28ca0c7f0aac8d23353eb/93914545318.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/s0crol5njqbrhhe9qi62gbjep1/pemoxazoxilajasewepef.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91676532102.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899d0773fe9---91345402741.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160abda3db3750---kegesinupumabekasogag.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/stmgs9qa2s2ll220klv0f02och/6523276207.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8d3c5520---dobofujesude.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f4e27a8e09b990f584c25237e53f6fa3/nokajavilekotu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c928848a8e---jozanilopewumiviboka.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/kudawibofotetojulutamom.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gomofibixesuxelozum.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/04701af326549dd7d0e0f8793528b8bf/68565950036.pdfIn PDF document text
    • https://kede.org/userfiles/file/segodazufo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb9b4885a---fusomabekifu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2891679f83---6458128577.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00034a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A77 17324 bytes
SHA-256: 281b759130a32012875c9669f7998a0556c59b0c7b5a9f1c635179b5639ef97c
font_01_sfnt_off0003780c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3780C 10312 bytes
SHA-256: c39cf606ba24c5383fc113bb5d304a35583552d6906f5202c7e15d93e1cd3532
font_02_sfnt_off00038f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1