Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d547a840b71b92b…

MALICIOUS

PDF

111.0 KB Created: 2021-09-03 07:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e407cef23bff38c1b2f6ba30daebb31f SHA-1: 513bf441f39575346e051cd5bc28dfd6e8e198e8 SHA-256: 2d547a840b71b92bd53f830faf4a8f05f9ecd1c4db5bc5e84c712cf9856364a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised WordPress sites, with one URL specifically pointing to a malicious PDF. The presence of numerous links on potentially compromised infrastructure suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f7363f899b054093c8b6ed5d5037cf65/xixojekimeneletonugeput.pdf In PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/misepalu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847b599f52---gipobefosabojameredini.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/93760313373.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54224463259.pdfIn PDF document text
    • https://datawire.gr/files/files/45104831150.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820136bdbd7---kirimubedan.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/38051360889.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/78545080944.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/avogesivi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f4bbac48---82078008517.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/17514679409.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/sitaguxosegojularo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160844cfc6bcb0---8041477554.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xosilokat.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/5efdb47dfa213eb69711699d481e0c55/98374572466.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1960b29600efb844fc72c243b59da7cd/1156437471.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/varujupedepituwivofokibim.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4f37bb3da08f5ed924ab2d938672432e/73961909665.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/puxebagexovopizoda.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mefeti.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///vegogulinufave.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3503798769---wepisabegitikojasujuwaz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2pqjvgp1s688tvs1gmr8f6ha20/31203979268.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kuletiko.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/64830951244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tratado+de+direito+penal+economico+cezar+roberto+bitencourt+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_off00014952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14952 10876 bytes
SHA-256: 4c85076f6823715f154e865f8e516bebf5bbf527cc39da50cd12ad9094fd9fd8
font_01_sfnt_off0001622e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A40 20592 bytes
SHA-256: c7cfb39c3be2272ed4899df6afea92d8756de437325f605d24cc29b267ec037b