Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f996611f5b7164…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 16:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cedb53d081a826d19389b7d2a7b1ab8 SHA-1: a0afcf7505218a9196c4aa1a4df2f611b3dbc340 SHA-256: e0f996611f5b716486547c597b606155b2f167b056a836a53f23a2be82f004a0
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many embedded URLs pointing to disposable hosting or compromised CMS upload storage. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://studiecarriere.it/uploads/file/19438900152.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b0c971cf---fenijowibilij.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/60972568480.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/65008095605.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ce7c774540384b7f6924f0c15f8e87e7/24285686392.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/sumufegubiwiwuwesi.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pikadabomigagedakipefapol.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/xipiser.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2c4d05---bozomisakemagojeb.pdfIn PDF document text
    • http://chipgene.com/image/files/20210915_114743.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/49519114674.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/45ccabf8d4e5a6853470f1c0cb7974fc/22947163224.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/10119743138.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/70177698977.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/78244095052.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/manawodutadifaxiguxero.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614122cec4d53---nakijedekelusulidewanoja.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/tozopemad.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/jatuzaposejudagagamekumek.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///43253017669.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sudejewoxixitefonitid.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/zigikupidatomusen.pdfIn PDF document text
    • http://fourfoods.com/images/files/85810933453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sven+bomwollen+apkPDF 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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 19324 bytes
SHA-256: ca6a51a31e616f8a29face16b155203e0d86bcadf55c9629525cab5cb1709ab4
font_01_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 10416 bytes
SHA-256: 0e70361d257005d36007bb1c04605716bd87d6b8adf90d4e633e1ee333395981
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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