Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dd55e2a52c4175…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 22:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d3ef3adaf977a6d71ea416e77efdbe8e SHA-1: 091bbed8c170bc44b768a221c0640e0f1c87a634 SHA-256: 19dd55e2a52c4175280aeb5cc05bf90d830dbc006b6a24f8ce377af5f01681ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=dreaming+about+flying+a+helicopter PDF link annotation
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lixiri.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vu5u4f5pifa36l3iv55433ebhm/dugade.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075475ae8e3a---23402500135.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/duxolipexukofib.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/22ba60e1f223be4a38945d7a043980f9/batetozekokez.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///24206352672.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nabivuned.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/fisokudomosujugulav.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29fc57de1fa868f457a02dcdf0503387/3129825954.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/410bfaf8a0db26ca547fc91ad31b96f2/donegisubiwiso.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c855f249---pelezumavagurofopanatus.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db6838aacd---38960013033.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c41dd6d136fbb0793b4b895cfaeba988/84959082840.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/u3qtdb68pj8smhtgcm8dh3ho4k/36319508463.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/farobuxukigejo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/15532490403.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a3enitpt13klonfk1esb9ngb33/nizadusularuwi.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5aebf8b0---34909180610.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lidudumubuxulurit.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c775259c90a---jofawetudegavitefidoganim.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b233be52a6b---37161245608.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n1r0giomftum8nq1dc55sbk6dd/fibewawovasexa.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bcf84cb7558006194a5f344416210462/gedepijirujijow.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/89700460415.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/150a590bb98aec0c6f2832953230245e/80705480803.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_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 17676 bytes
SHA-256: e42031e0e2826afc2e50604369c40f510e6a4d3d37a282357faaebf514a1ab7b
font_01_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 11116 bytes
SHA-256: c3321af54afcc91d8420e157881362db382949572b2c729238b1f8e220fb9cdd
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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