Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f2e6af51386e8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 19:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e9f4d810c806e59eb100ad9bbee2e1b SHA-1: 984b145eadf34f4f7c5e4d4ad6e44a75e8bbed18 SHA-256: 907f2e6af51386e803b8a98c970c1ac3d34f00c6af384070b409a0067c3393fc
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 websites hosted on compromised CMS platforms or disposable hosting, indicative of a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://centrorevisionimonregalese.it/file/72708883072.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d9400c91---76961391197.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/76b2d67b8339544c620668a7f4f29976/xadisodopexidi.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/dunuvenumidexexetilikex.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/jezegijofusaradedibip.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c03629cffa3fe7c4bf18c0d98f86b7b5/77038173093.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f2149688---timubosimuterugi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e158fa124ef5d5ae655d8bda91044111/52438878306.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc0609813---wugamonojedojosenofe.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/9789227777.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/31100671551.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gikopuzoboxumobemaxodoli.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c359a34348---xavibulejetefojomokolem.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/7424211669.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/vakolejepuvavagab.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/66236891254.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b00a52615f79d0e37e3ba7ef7dad03aa/81708848662.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-31/20210531195030515231.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/topozexawoxonebufokibi.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/70349844027.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dazoxoxopag.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/83fbfaa3266a9f84346752b5f2806453/fogokanigatinejor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=python+programming+pdf+2018PDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 11216 bytes
SHA-256: d09cdaa1bc784b4136ba74107c3de7b1976f5cbcbb36b23473346f53996b0e45
font_02_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16816 bytes
SHA-256: 8bc87ad9e36dc965103512de700877c1fad9e3f2cfd1abcae4979fa7ace2403f

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