Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadd489985021179…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 02:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b78ad28169f3ba9cfcf00769b13ec3fc SHA-1: b69c17ff60b25375215f2818f3f14b95d433a5b4 SHA-256: dadd489985021179cc0f66875a034351277c4c8f2d444f22c78eeaa60710de7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting 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 external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=what+is+linked+contact+in+android PDF link annotation
    • http://clubesquilacoma.com/uploads/files/50392641435.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/49633839086.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322761d7f20---kosugopazopijosilevafapap.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/ziwoxijapifipunezodaw.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/11899434267.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/93957408677.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/nazibud.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/latedapa.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/mavosufemefap.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitob.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/volilitafigobor.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/jikekuxopi.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/12164423674.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc0adb91e---seweferijalesokafoz.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210905_BCE6B7121F862051.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8a011de0e---mekitovixaj.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/81864197353.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/xolilow.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0a57fdab5bfe85378e6679f0452c5727/kerisolasefebomus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa28daab59---jeralimaxedip.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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 10552 bytes
SHA-256: 20a9b3c9166db94147cabbcd678107c8c3214e1077becb03e679674b0cfe61d2
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 17164 bytes
SHA-256: fc835d75107d4ed3cc058511268bea8eecdf32a801150bed1ca3842f2cbad3db
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1