Malicious PDF — malware analysis report

Static analysis result for SHA-256 88299b2e5c5dbe08…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 00:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0a4d7bf49e968868d343eb0751d3335 SHA-1: 10491fd20912a1bfc16061b557292c1d1603b972 SHA-256: 88299b2e5c5dbe08eeaf39175f61b4049a3b9acc0b6f02fbe25fd99675f7a222
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://eatoceanic.iorderfoods.com/uploads/files/71284712130.pdf In PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/90513287022.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/43952832265.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/64871049152.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/natalujirixug.pdfIn PDF document text
    • http://airsoft1.ro/files/file/33432108518.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/49424231531.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xoraxuvexanid.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/17552165981.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/18194127449.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b8316f6f---67903123012.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7515814f4---93201345448.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2334311005.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/53636642d1c10c1006dc0c79e8d34020/kigapiruxon.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/20555688709.pdfIn PDF document text
    • https://cubic.is/userfiles/file/2828560896.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/77157091657.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92227f43270f0207bd5dfffe27d6be52/nizeropokabazisoj.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d8734d34---47973899937.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161194da4b55c0---79807896520.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/55e7c6ckcsm4ruoti0aq1p08id/84377036324.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cc99ed9d---10033514847.pdfIn PDF document text
    • http://chongros.com/userData/board/file/29723619042.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/55627568086.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31a55b57---19693056122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=daily+bible+verse+2019+pdfPDF 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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 10952 bytes
SHA-256: 2e2b06635f722b3c2e03f6ab172d84bf657c12c93fc6249684e6e44f97016399
font_01_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 17832 bytes
SHA-256: e612e6e32276b5a30848a6b58929ae29625f2ed101175e6e4f7c195578ce3001

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