Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89c5101d2f48a6a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 16:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 199ddcb44bcb6414b2bdb1284090ffc8 SHA-1: 7639abdd16262250479ab6a52edb7414430b475b SHA-256: d89c5101d2f48a6ab2e5e975016f202bdd546bc8c464faa197229e9f86776c16
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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the PDF structure support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/322ca2df71b30de211f131fd65954dd4/riletonokumuvevi.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ul36vsn2ctn2kjinmc62bnk0a9/japamavunagazukilozezi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e133831fc3---8972769065.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53baa90bd---wekodu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/titomidovazagumefiregora.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/gatokavigadowezedap.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe815506f---41287527353.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/86731939397.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/bojabovedo.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/talik.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/20539752853.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5euubdifh5pg0mcdfj9et90t5e/95488081247.pdfIn PDF document text
    • http://voijin.com/userfiles/files/13374496550.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/21774996705.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/romoxuramudas.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/19571019610.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22527690965.pdfIn PDF document text
    • http://fnathservices.com/upload/file/55048979639.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98092677183.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/44903670870.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d563d7ad10bcb6b205dadaf8e7d0165b/19763149481.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82125551666.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea40f9dbfa---jejerukurutekejoja.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/16883729189.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/48463425501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kuroshitsuji+season+1PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 23016 bytes
SHA-256: 7c195d06b9af7b62dba0198ee7e03220b9567db989195fa85bfb6d1fab22e95f
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10432 bytes
SHA-256: b39cf70384c7d7cc011246c4380fde734df02cd21d38920c03991e9e35b23523
font_03_sfnt_off00011d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001359c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359C 16340 bytes
SHA-256: 09788640714c88458583010ca9c04064c4af2b092f38c1997c707306d8dd54b5

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