Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb72abbdb3c072f2…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 09:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44f4f885ad95259aeb53aaa0f8e0f330 SHA-1: 43876c0133fbffc3e575b0b6fa733039a9e4505f SHA-256: eb72abbdb3c072f233fadc689e6e91d6a538aa36574fe526880fcbcf3d499d9b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to a variety of external websites, many of which are hosted on compromised CMS uploads or disposable domains. This suggests a phishing or malware distribution campaign, where the PDF serves as an initial lure to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=an+attempt+at+exhausting+a+place+in+paris+pdf PDF link annotation
    • http://lukoilmarine.com/ckfinder/userfiles/files/bazubedaxuminenosawofuw.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/27730460208.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74acb98150---43838457559.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7eb85ee2---84851584204.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83098736940.pdfIn PDF document text
    • http://quatang3t.com/upload/files/35468541127.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/medaxizafowes.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/mefote.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/98232572686.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/580bd62d6c96aa026fdf0c498fb7fba4/xetulekamevisuruwa.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/17426532309.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/lolulagofawotedujuzigo.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/25782224035.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f61a313d---pepawinasopibimumir.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0c0b929fd750ec9a67925025343289ba/62394239393.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/494a9b2e1c4daab17beda974e1835829/wufuvorixobodiwokiralak.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/tefowumelorib.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d87aefc9e---657792225.pdfIn PDF document text
    • http://gptools.net/userfiles/file/pojuripopobosafutixipix.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/80445937772.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5b46b9aa4d08943c9f10d42c0a45bcae/labesobon.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fd530992a---padarerurofi.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/febarimuzamuz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054861955ff---kigorinosuzekiwekexidiv.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 19492 bytes
SHA-256: cbb9393938958a81e0db689ccd73312f36b1b001f5370358ec49b2ba6e27bb43
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378C 11132 bytes
SHA-256: 97efc68b6e8d9bdc67e9a3529bd95aecc2f7625f197811be18ce1a5c265f5289

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