Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b0ec60c23cdb7e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 10:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edd1f4118dac775f010605b6be779dde SHA-1: 608f29ca790c5fd1ceb9b1e27e07eb6c0357e385 SHA-256: d7b0ec60c23cdb7e627e6713cea26510ad1385dbdfa3bdbc2bf697ba2f15d0ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS platforms. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using disposable or compromised hosting for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://conrays.ru/f/data/81909490968.pdf In PDF document text
    • http://gidaero.com/upload/fckeditor/file/9143516842.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/kuzuwiv.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/72892502846.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210904004515.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c0433fc2c17455b422a45201c2a5c10f/bogedajepomufukigugi.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/63050043126.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lofusol.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/20223643639.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/75bm1kpfmnms6hkp460vqnpr1m/4792852942.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/natuvabijiwiw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2dc310bf---watozaros.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/bugosufuwi.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/17899493345.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/45903443159.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/zijikof.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/somaletaf.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a2304b43---50922780228.pdfIn PDF document text
    • http://change4best.ru/upload/file/wifenovagunumumetaro.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161339880a4261---151055616.pdfIn PDF document text
    • http://imoroz.by/upload/file/99925806246.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3bc74eac13cde13cf83cd7cdeae1dc5e/73114844879.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/takokimibodukavubimukej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kick+the+buddy+mod+iosPDF 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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 10660 bytes
SHA-256: b3e25b90b3c6256e265a544c15adf692a159caacc8d94276674e2f6d8fe2c6e3
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 19088 bytes
SHA-256: d419e59fad078c48be3ca83d9a4e06bb7ec350308918c31cbea616087d57e306

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