Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5cb7385c2f8f0e…

MALICIOUS

PDF

78.3 KB Created: 2021-08-29 00:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6431964ca620b5a1f2309954d0f3fd88 SHA-1: f31c005ded00735b39632f64e7c88d5744c534e3 SHA-256: cd5cb7385c2f8f0edf1d4b12161e902cf57e7260b38f0aae6623e0f60325eb81
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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 http://chromatographvials.com/d/files/52224429023.pdf In PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/21961387150.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/87604324427.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16118c97ef07c9---62775644332.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2deb08edb---40671853042.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91466ed57d---birejofisanalovujorubizi.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/91213868128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3d55048b---jepalelamot.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/587048862ce9e07143874e6aa2771622/soxonamiv.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db0cd6cd254077b1a31a164586d34f8/49589659594.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8bd149d337227bcf547318c1c6d72803/50890180908.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/risadagofewem.pdfIn PDF document text
    • http://voijin.com/userfiles/files/reladilewosajufofal.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210712194303.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/karinemugodew.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/96655419601.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/saxewukugexovebijisusorox.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/bada518d3c2c3534fbd479b6d7ab868d/22622622499.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/80351961100.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/45740162449.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nimupixitakaxaxikinupet.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b2c43f02---pojorazopumepifurigapipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=don+john+in+much+ado+about+nothingPDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 17860 bytes
SHA-256: c12c4c80d3ffbff514445b4550fee03a94beeba16d3757f2a6cb906967817c4d
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10744 bytes
SHA-256: 11d3c2655204c7c87b9e801c33ae749bfbc9400f2f2260f80d5e043bca65b2a8
font_02_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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