Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9e33d53cdf44d9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3830224a4e74ce435d878dbcf04d729 SHA-1: ffd71222365aecbb1421ebe2c6d7ccb21ceef114 SHA-256: 8e9e33d53cdf44d97aac8a520f59e89b1fc503801bf3c52e1039f18cac022d80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=spaghetti+marshmallow+tower+worksheet PDF link annotation
    • http://epoxidice.ro/mm/file/pixugugokijifu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kmobaa5nr3ho35p4qapc61vvm3/xibuwejakoluvusefegid.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xotakipuwujag.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/387ddb40d9929300bbdb67f6b2235ebc/97473765645.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/kigaxefabagebuled.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/22145405251.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/tuzotexodubutimowabisobul.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/66715c56b3889a0e41d01e5492bcf289/31487120097.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a6ed3ecd46f0997f80da87e12b6491e1/55016769853.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/vuwutene.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/98024893859.pdfIn PDF document text
    • http://farashimirooz.com/files/62519714220.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202108261651012288.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27868c6b3---17859264417.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/96617583167.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0b8c9b58fb32f7196b398ee097b7eebc/salowuxewawozafexekabonot.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098bae790af6---51782583172.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/lemuwixozumagileb.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tojivajulesitulixetiw.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/93c9499b75f65f40dda4f92f5f1e2a6e/mudujup.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/sigapimi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9321ed02---jizawudemitebezefumule.pdfIn PDF document text
    • 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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 10848 bytes
SHA-256: b87088baaafd59de4b4c66e19bf81108db69e44b1afbe07253815b9c100f3558
font_02_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 17300 bytes
SHA-256: 211c35610544de90fa0eac621dc276d1db4641e9b172dfea607abd9779071b25

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