Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31d4fe6404eba53…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 11:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60eefba8c42b19fb7f1ebcb0b92b2f83 SHA-1: 2df9025d3dea744d35dc82b6d6646c192faf15dd SHA-256: a31d4fe6404eba53f3fa467892612ac41999c27aa124d0bee191d8df6cfc4d6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jpjplumbingandheating.com/FCKeditor/file/dedizojetokiwiraz.pdf In PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/49974925359.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd8dd7b0e---lukorusogomurupewomeviva.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/runoresuzu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/140d45feofelk7pac1bs5j0lcs/37881065749.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765b529993---kawovewararo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zezoxis.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae0d38f4ad---29776858865.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609738e27fe97---xaliroxokapiwowudizizob.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe636cf9f1---31682010394.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c349f4cb3b96880f7d6fa229eccb8e14/74698695595.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e246c1fb87---kunaduxigakogariseda.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5b73e4450---94351185915.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f531b18496464d57e300c201666fad6b/34720129225.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zodulenedub.pdfIn PDF document text
    • http://splogservice.ru/content/file/63864402380.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623106461.pdfIn PDF document text
    • http://iwishop.hu/file/15425967120.pdfIn PDF document text
    • https://ka-base.no/images_content/file/82630379924.pdfIn PDF document text
    • http://cartopack.com/Images/file/63234714135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=new+headway+pre-intermediate+workbook+with+key+fourth+edition+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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 11092 bytes
SHA-256: caf817dbd1fec4a5758b7ec237eb4812f1870d116d764ac5a169416baa94d42d
font_02_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17296 bytes
SHA-256: 38fe091922e02675c9fe9b2eacaeb140f223675a91d18e9445a0b3d0ff011bb9

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