Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d039c3aafeca4c…

MALICIOUS

PDF

84.2 KB Created: 2021-05-24 19:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 614e07a4a16f15e5e3556f65736a367e SHA-1: 63ed6d5ba7af0566968282d9a8aae2e0343148b1 SHA-256: 04d039c3aafeca4cdd330e2a1a1955b487f0fc1f50a1b4b91d185b4e5baf4b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing lure. The document contains numerous links to external PDF files hosted on compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=edit+camscanner+pdf+online PDF link annotation
    • http://toeicspeaking.net/_UploadFile/Images/file/ripekojesatalageko.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nr51p1br1s8cjtru6n97ajgcms/gukogofu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/60njhqgmajo35qq1s80ck0up2g/tituvedoradawewedulew.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df24b4dd25---55521356101.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543fde8bcc---batuxubosaleg.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0q3dhhfpmgo2pffikp52jo3bdu/93252959179.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d866ed99---wuvufu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609130a584104---19799685661.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80da7dade---seripobulolokanukozaj.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b897l5kvui1huk9pl9bakmvpk0/xodaroza.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68210db84---19893347604.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e9fu1sou93u2rukjsaud2dg7nq/6945743160.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/54491887695.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/bivinagiroxiwatunelakelon.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/18103567406.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515085456932786.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4025fdcae1f4661172cf136d84f11c88/xosezuzidigepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 6672 bytes
SHA-256: 8977587ff49b20f7cf883d9478c4f08aea455bbcec8dd0720d76bb623a33b6ee
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5256 bytes
SHA-256: 738e9a00dbd47b5fe226044ee0edc364de7737666dde1a1cacd528c3ed5164e2
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 1608 bytes
SHA-256: 8ed974ddd8342ef61c9b8084b57402e5022028710d962d2e6aedc1070f79942c
font_03_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 10480 bytes
SHA-256: 2b084d3c8aa68abd425e67c5af877e7c428ece33a53645e38282e91b4f1f1ea0
font_04_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 17628 bytes
SHA-256: 589d7c1260ddb702c03b5d531e33177d5beecce812d813522f06a48b109d5977

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