Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc129a976386b35c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 493035b899d65b055d7a8ab88fdd5a0c SHA-1: 93624026e65c8819fa1cc7309bae08d54b29fc0a SHA-256: bc129a976386b35c5fbbaa57f0df073aab26a863492ebb0f236426cf0cb2cfb4
156 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 document functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://wxeina.com/userfiles/files/lorasatol.pdf In PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/36246337246.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f452e7d70---54441246079.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/34e11a8819ffa83ff25e758edfed0292/61330138082.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/69798683576.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607352092d14d---pejexenomodow.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5118b0ac8260bd98099fbe1d567657d/35127039362.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/97bcabfb56a4d5bfc7770b298c34f62b/84770157461.pdfIn PDF document text
    • https://medtek.vn/storage/file/bugidaxubopasur.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/r9bkrs2t5qu4d4jk9g85erk5l3/kituxirefa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c98696eb7---nenidozefufasa.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/degigitesemolibi.pdfIn PDF document text
    • http://khocabien.com/uploads/files/88924740102.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/pesivisogizilepuvile.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xovejopom.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/45555952745.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lukukeponojegatobu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/21ac3a6972f3f97d0e0af34e1a1ece6f/9341161325.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/85179701275.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/gusitepovidu.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/67854831051.pdfIn PDF document text
    • https://ksuskalology.com/images/file/57065429217.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/37164186872.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/702000e7674005725c0b5fa5bb7a21ee/76832159802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=materiales+metalicos+ferrosos+y+no+ferrosos+pdfPDF 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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 18768 bytes
SHA-256: 7051805f6edbe6459b746059d93933dd547ff387a876f8c211f4dbe1d7cd9965
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10888 bytes
SHA-256: 093236b6964dc5539d110132968b55689ecc7d07099331e07bf4235cce14184f
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1