Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ad7f7f7b5e938e…

MALICIOUS

PDF

76.2 KB Created: 2021-08-29 11:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 92334b649efe271a96802aa0e7380fbe SHA-1: ccc2abd60f5bf8e44a67ab3e9f71b62bf77bc07b SHA-256: e3ad7f7f7b5e938ef19bfd69b8a15cc0d110e360cf4f1d5ef5bc430f7a29f788
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with numerous URLs pointing to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown PDF links suggests a coordinated effort to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drsubhashawale.com/ckfinder/userfiles/files/rogipokokizeput.pdf In PDF document text
    • https://hotelmitrutarija.com/uploaded/files/naroforoboxelujulo.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/50178806666.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/26303745769.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupojazedadadoxa.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/jasomaxetolomuxedok.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7b52db5c8195283cb321156ec62dc0bc/givodegupinugat.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/remanida.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/rexepex.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/93473894126.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07a9d5808---37066224637.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d00090f63---wekelefej.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3df08cab---80638565354.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/c881p8bb7fnpi5h896ce8nnc83/15576825217.pdfIn PDF document text
    • http://vtaky.sk/media/file/89105719086.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c641c2f12---84979617784.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/larirerajekidididozoxigav.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856ef0eaf22---pikukudewuzifarefipuru.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/60753883064.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6avrap8ll15j131rtalfkl1780/mezelusosaniwasejumul.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e8c7f830---zovesadenuvix.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/55240212402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+homospory+and+heterosporyPDF 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_off0000c554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 11180 bytes
SHA-256: b8ac0eab6bcc53d87e423a7caeff32bd9aad8b10e95f4fbd869c38a3f0b504a8
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 16984 bytes
SHA-256: cb136fe3a6c6ea3278bfdfebaa27631b9c23e340228f7cb66568726abef5a93d
font_02_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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