Malicious PDF — malware analysis report

Static analysis result for SHA-256 174f52be0edfd89f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 10:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: af18d3905ddf1b1ab936299dffd7c4c3 SHA-1: cd10d84620aa67c60c3a761bd062bb2e00ca4838 SHA-256: 174f52be0edfd89f0e08e15ee6eb6ba6862e130c4ce5bcdf92c2db52f79d0942
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mdfgiare.com/upload/files/81560650799.pdf In PDF document text
    • https://kiptep.ru/file/jorilekuzebijawuzug.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ht2i0cv1ptinq739c7g66er512/gizesuwadamokeku.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/81302573267.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/78599291755.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161342dba119e8---mimiz.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/26337649518.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xarusimadiramoteb.pdfIn PDF document text
    • http://portableandcool.com/files/files/nalarizibebapovela.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161331c7f119c9---sezibisonod.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/83917056908.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/39526234512.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/98921011191.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/pipexolukudogeva.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/jalivizilo.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6136C94124218.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/9774155597.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/77025154273.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/42087794179.pdfIn PDF document text
    • http://bastola.org/userfiles/file/71673979447.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/jozedufusete.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/jusagizadukoretem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chrome+dark+theme+settingsPDF 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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 10772 bytes
SHA-256: 067ec7a2b596cb3d899ef957c81a60b7a6dffcd2c44bf090be3c278e6397d126
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 18968 bytes
SHA-256: e45061d910305814635f429ebe381f6a8e4a92d43da451373455df55ab859811