Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d41abc879f6a3e8…

MALICIOUS

PDF

92.3 KB Created: 2021-07-01 19:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 736044e91f10ed17ea4669f1a6556bae SHA-1: ebe5fdae0eb4604f0f034fa7aa12dcda4114ad99 SHA-256: 5d41abc879f6a3e80c3ed86a46f26f9767a5b30b3d82be515744b195e85a9e50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=godzilla+king+of+the+monsters+free+to+watch PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5b8b40f7906e266949abf156df277144/35649666497.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/46205398532.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160877e16c030b---fotixom.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/68468528194.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/33540616888.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/19064937062.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n5frv81kap4nno6p9m6lilmca7/roberuzowe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad89c142a---89243778280.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21a62fd53---68059104696.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3177f535---82713959191.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971c6eb7dc3---sefonanejelanikokupivoto.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g7g302u2nmqrmh8ae8df4c2fc6/62872940785.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54fb90cb6---kokasugafe.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089dc748c87a---14044043268.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/rabefugutowubizaxaxes.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0fadaf20ff3e52e57215f939f832daa2/85347408330.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dizewunedizawimutedol.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/87155970493.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/28558467660acd4f30272d.pdfIn PDF document text
    • https://adikkedua.com/contents//files/69876860038.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_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 17964 bytes
SHA-256: bfaafb8a9b0b5185c391acdeb2d4a45a9efd7432283b6e229d466fe81cd2f18d
font_01_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 11200 bytes
SHA-256: 24065156902b65f460b334db6675818929224f00ed7c8cbec2ccc7b4ccef099f

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