Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2e9b2e96011cf1…

MALICIOUS

PDF

72.6 KB Created: 2021-08-08 15:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cce7e7ef266405de71782a51d21d2ceb SHA-1: 188b9f1bfb2971176920ec73723ad3538ff99a6d SHA-256: ad2e9b2e96011cf1db40a154e0baccd25ed76faaff0998e684f60f9f15df1b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised websites or are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of multiple links to compromised CMS uploads further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zionapostolicministries.org/uploads/file/17231612906.pdf In PDF document text
    • https://edinburghpools.com/contents//files/7648445790.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/03816b7778416d5c606427210146258a/72858152430.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/84675376117.pdfIn PDF document text
    • http://secretinvitation.net/images/files/95765769087.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/97688653978.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kivixusosefisegejabemawim.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d56e0807130---79081323594.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/vigolapozifif.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608472831313a---mububumapi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a48125cdc---40778065061.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/gibawuneje.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/63744927670.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/6693217891.pdfIn PDF document text
    • https://bloomeng.com/uploads/rabazivobalemekurup.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/gobumibogulanipomokog.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6ff2f7af---zevoro.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16108bb2cb8c1f---fowukex.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/aamm6qmu1g1b4c8pd1ema0kueo/lewetixisiradorit.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96880832533.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23304d25c3---lirowozuv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f591828ebea38417789ace2e36e3213e/lefirazesije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=comparing+and+scaling+investigation+2.3+ace+answersPDF 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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 11400 bytes
SHA-256: 3bf70c27e99cb1d114e62ac83561549e892c229838b1cf42b1ec61c157b086db
font_02_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 14808 bytes
SHA-256: ffa745cbf2c9555ce134259bcabfde97f1aeae6a5cff1a11ea6840edd9e96edb

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