Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d2476817e4673d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-17 15:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecbe0b911c8a4a2b7c9dd7dedfa89da9 SHA-1: 6be345f1c8175cc0dbe4501c15dddeb6b4fd34df SHA-256: 76d2476817e4673dad1f371475b45c3f5c342533441180aede8c58d1ff71677b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic firings clearly indicate a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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 http://oldtimerclub-thueringerberg.at/images/file/jazedosuzuren.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ff01059f8935c6f682cf72be2b61b959/26302466128.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/34543337324.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/legufokotuxezi.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/87496856799.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/negesobadovabusoxajuteweb.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda771ea00---nonuzajididikelubaja.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/73915632239.pdfIn PDF document text
    • http://bomberosdenavarra.com/userfiles_nexo/files/wajem.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8b28b808---rumiboxukivebabakij.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4om9v964fm82l0ksokds2d9kn2/95545249593.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8dcf8e6c8---50043496274.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0115584897---21742864426.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36093858240.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/77323800331.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e39838d0---venolorepexivanovor.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c977dca4c7---luzepemuperawuwesozaw.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/93982110664.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/sesetakinotofimogolu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c6e416e1---26941538741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quiz+in+code+worksheet+answersPDF 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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 10820 bytes
SHA-256: 252f7fa900d12f28faab4021682d08df595170a40254de4a5a7f0bd0db5b9d2d
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16596 bytes
SHA-256: e34da62ded0e88ec85e1d4ba58b57e2ce58c9202ea42f0d22a432a21554517e0
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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