Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bc910510471c3c…

MALICIOUS

PDF

87.6 KB Created: 2021-08-11 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71a1cc307eb2003254d75edd094d5367 SHA-1: 8c42eab5e96658822328310215b7cfa4e38602ef SHA-256: e4bc910510471c3c5b371ff8670fcc8e49a26e219ec5a0bbfe17516acbc77253
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608215be9494f---bibapep.pdf In PDF document text
    • https://diarch.in/WYSIWYGImage/file/94224468856.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bbd25f663c19ed8b646ceb5a095198b1/45494332704.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4193237c2---xepugujijobipixuvebifewi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1l23rvp4u9lvf7adksta4imso4/91684190914.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a6m601o5o3trcbi9pedc3nfs0/tidusizamibugezevevoribol.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93b525929---75962351960.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5285cd9c9---17829452993.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b6b96890---80708298609.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e27e79b9---nekinowujagepapipisu.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/1565394383.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f3258421---71456847567.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/kodotazem.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/tuwiwonorabi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/kojenikudupipaxidufilapip.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57ed3717c---kulaganuwubotufutigigup.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/3086706750.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/92779551754.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/febefiweg.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ddb3ec00---7974717898.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/ruzizeguji.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609240b279f34---vikazijipomanizip.pdfIn PDF document text
    • http://fitviewer.biz/files/file/2285602038.pdfIn PDF document text
    • http://apvn.info/userfiles/file/wukiwupam.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184fa504ac---94785561831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=coniugazione+verbo+pettinare+forma+passivaPDF 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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11052 bytes
SHA-256: 7b122665ee6b186ac5b88fa01ba6fe8268bfa4d63c8309211b44fc9e4d213354
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 19228 bytes
SHA-256: 009d7f70032483940fc83d38cdc93ce02cd3f98a6aafc28759de4b3992ecb553