Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a23cf2a15d199b…

MALICIOUS

PDF

101.7 KB Created: 2021-09-13 16:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3d6c9fa3a83008c4467f27e3995702bf SHA-1: 757c6d4aeb8309cc458287f8e7ba2b973c1f9d7a SHA-256: 38a23cf2a15d199b6e994a4986941daaecf79d0d005557728e91e636c0402045
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading users to compromised WordPress upload storage or other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack pattern, likely intended to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850042f1d3---22357053972.pdf In PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fefodezoxitorat.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/muwidawejipapujerilupa.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/lujulaxobu.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/tozuxabofuxugen.pdfIn PDF document text
    • http://agrion.org/upload/fichier/15561777723.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/68005345806.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbf10d108c3ff99bf2fe9b611045e875/12959472131.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/xatapadepumazili.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c700bbb64---30445357808.pdfIn PDF document text
    • http://checopharma.com/upload/files/vomet.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/5083483699.pdfIn PDF document text
    • http://portableandcool.com/files/files/39421151715.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210906_043555_191.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210908195507.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/ralasexebifawuwilikesegu.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910094559.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/43606435746.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/41128705515.pdfIn PDF document text
    • http://sacc-la-chaux-de-fonds.ch/fichiers/file/47347557312.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mozubupufu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/92498374137.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/64709652009.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/36463486117.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd4c5dc17---11362673821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=turn+pdf+into+ebook+freePDF 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
stream_003_off00010e65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E65 17468 bytes
SHA-256: 9e4af6ea45fe4cefccfca24ce51c0a103884ef3d7af16109ccc3d2d4e5d49794
font_01_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 10408 bytes
SHA-256: d1ff2ec6d56e78ce200d705717e4e8681ee4014929ba21cc1a4ec4e01b86b0e5
font_03_sfnt_off0001584d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584D 18276 bytes
SHA-256: feb450070c4c55c4d4c34a7d0fec7c49e7c1bdab5a858ec0592ef759b307ee47

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