Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f6defdab604ee3…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 12:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a04404fa2b0c9610a3382f855fbdaa4 SHA-1: 01403a6fc3acc693c2187555ec64c102b8a1e032 SHA-256: d0f6defdab604ee3167875b3d958427b558ed22718041d3dbdc880ca75f82680
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=insight+ias+monthly+current+affairs+july+2019+pdf PDF link annotation
    • http://parkhighclassof60.com/clients/871169/File/xagopanajejagubejumifon.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/29693352959.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b6187a8276c4070cab6b7dcb9f6ad9f9/35222646924.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/32390149623.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/56597847675.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8a38700ea---92680530961.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/94306954966.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061910020570.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/21817465088.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1840ae1d6e---tedekubune.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/ginuzejipajefaza.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bf354d0889ac895610d9ce648dccd1af/25641587042.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zasojadijoduxavolivura.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/17276285841.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ci31o43jk408hgm1q6fl89vaq4/87009520685.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/jabix.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210708_170605.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f6b58a1bbfe8dd8c2af0ba4f951a419/bezapomanonusunomorifek.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722330810bb---pogiborawitufodu.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/26490597145.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/liruwosizobixolobepo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/44778535603.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ea733908---49289574435.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2439a34196---32765978458.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_off0000be4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4E 11824 bytes
SHA-256: 020638848af41665ccf7255ae06f6dfa3153593e25d6fc44bc4c25aecd11a3f7
font_01_sfnt_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 18504 bytes
SHA-256: ead88a8b76f73b51e0cdac37d4289594903f743f240252b5ebee3934bfb7d87c
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1