Malicious PDF — malware analysis report

Static analysis result for SHA-256 7750329db0e91d43…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 06:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4629e6ec27e43af993f26680f5a9475 SHA-1: 26297e5379dbeeeb2fcf93e8d70e00e519475a73 SHA-256: 7750329db0e91d435f4b81f381b2b780a89f91abb8293e13061f82c037719b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristics suggest the PDF is designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=meaning+of+ariana+in+the+bible PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ace047706c---87877450900.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/nekuwebazo.pdfIn PDF document text
    • http://orthodoxnews.us/file/15760366055.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/dujotelu.pdfIn PDF document text
    • http://synphabase.ch/upload/file/babikuditukogunelu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/26179635948.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/16470247983.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/8616441523.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/9817444401.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zosesexexukirarugo.pdfIn PDF document text
    • http://grimastone.ru/files/60187468379.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f25897e38---toritavut.pdfIn PDF document text
    • https://haidangpc.com/contents/files/muterowibejidi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615039d4c8c15---kolilojuzobow.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/87239287200.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/zukijuzuwe.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/89598909496.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fawot.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/kalikuzarasimulader.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/miduvew.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/dagikatixagez.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6ce5c9ae34340276c4468feb394d748c/72932292527.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e2c33067---bogiripol.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zosixisidanutojapelafe.pdfIn PDF document text
    • https://olterus.org/contents/files/sabilapef.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_off0000b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 10456 bytes
SHA-256: b5356e11c11c8b6052ec7dc7ecee328103ff4f935a1b75b05526241e9d0eccd4
font_01_sfnt_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 16212 bytes
SHA-256: 4aa128491e141dd3643312dcfc60985ac531c9c07011e7fb919f86778f72e2e8
font_02_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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