Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e3251451e8de15…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 21:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d34d009a47421a896f7e097663d27e35 SHA-1: 99a6a9ee849f5cdca6ebe11c4cb31137112a6d1b SHA-256: 03e3251451e8de1593e5bd013e39623e660895c7d1423063173874aba1b144fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2345bd227---tonogepegabupubaw.pdf In PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/pemakofafonepiwopejo.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/61611189485.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/tatosufafagavitosexikoma.pdfIn PDF document text
    • https://mfdesign.hu/files/file/76355212111.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xizixut.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/dawejijekurukorudedavi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/177781383.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/wijinezotareginexoboxato.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/xisibufubatubumok.pdfIn PDF document text
    • https://terracell.info/images/file/10508027597.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358939a174---waladinabepumosa.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nuboz.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0da01b2384eecfdc1bf1e681274844ca/vuladipulaxiza.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161380b502dbda---81890150531.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/46874407151.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210903203418.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/notozepomunapixabukub.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/67454331108.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/zeduladasuwarekoxi.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/lujonekubifofidulupatoge.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/jijedomelelaji.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tefufapu.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/4602046613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=zombie+highway+2+apkPDF 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_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 10700 bytes
SHA-256: 1378471397adb170962928f4cdef088ce7e81218092bfe632fda470651d311da
font_01_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 19576 bytes
SHA-256: 3272cdf29a54c8b611b7720b0c47965d8ffe965b2012411aafbe8b1e614c6538
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1