Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71e85c67cfd4e7a…

MALICIOUS

PDF

107.9 KB Created: 2021-08-13 17:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5493c80ceec1bf42e1451be4d3cb3df8 SHA-1: 001d517b6d0b4b3097d71d4d77e6adba9807616f SHA-256: b71e85c67cfd4e7a45c5f65b21eb988d47b9bcd812cf52f24c31cc2a4ccbaf90
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984288256c6---63469447380.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da70b77b21---xerateponexurezaruxep.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/81f86b2448671602703aa8b4eae7a61f/73405829399.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/majaxukonegen.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/53880618956.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f8a91359bd256c4f34c70d0adb382f11/46739666693.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc8ab7367---36497331602.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/9637205500.pdfIn PDF document text
    • https://rosycaffe.com/file/50680905680.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dfad441a1---dudizugakosepumejedevalo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a7717d74---lezezakiwexuxitoparari.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6d1622a683fff75dd0f3b7ac82043847/vixojebatamomexigarilupo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b652721b---giponijopomud.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd0ea7a95---ragisudeja.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/64085818987.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/29357dae7b7c2e329d0c57af8e6e495e/89106340574.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/54451697749.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/motezikurufemapoxiju.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/81527266810.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e18719b---sibivadusuroma.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/janemazixipa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0c5512771---kazuf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a8b61b73---befararimibiw.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3329ce5319ab3f84f8654e86e5bd05c6/tesuzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+late+bloomer+full+movie+free+download+in+hindiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 18664 bytes
SHA-256: c97f0ad04aae077cfc0aefc93750e7ae6513d63bfce7c5dca367c7076d8c6a21
font_01_sfnt_off00015ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D3 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_03_sfnt_off0001882c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882C 10804 bytes
SHA-256: 9036dce638b5ca8cacc1cb3d570c1c5c5678e380205fa157510226c3ab1b6967