Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9305272e40037a8…

MALICIOUS

PDF

92.8 KB Created: 2021-06-30 04:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a3a4028043531c318e209817343b1c0 SHA-1: 8460a8b812d958ac31ecf8e1958e4e6bf207bd48 SHA-256: b9305272e40037a84ee370cf0c536637c5c54c9f1fdf1c67ea32b5dba0d5215a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lescourailleurs.com/upload/editor/file/58755612967.pdf In PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/a4mbiuv41fpqds8b2f1rhft256/28096553675.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d80mhijo8tj45qup15vrj5h9l0/51524955711.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6jed1ef3lhl05bkib8c077kjq0/78109460009.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bbb1a602---fomaxu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/42751036803.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/95ce00adb27c9973ab78099f23221985/31772448582.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1a034ff7720bdb57be5d0f413ee424ca/2113163889.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/77ed52d48f92e08556022b9439283fe5/rifupenegir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18d15b454---gasubo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728e3589644---dibolilo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8f08b7bd0dbda7dfd423da4f3262c4c/22497335835.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/2ed0247776e6f0432eb6675a028a986b/58484071131.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a8da837e8ea8421869183e7a387cd2b4/67628213673.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/virebodojodog.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879e9819169---7718319967.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50658e7ba---52631130653.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/lamideniviv.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cd9eede5c460037b36519c812c525a02/95341596187.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/056373afe8257a0d1ea31d3a0cdf97e3/rikesiwap.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/nudifumijebodumujip.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/13016668514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+of+thrones+s07e08+torrentPDF 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_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 17980 bytes
SHA-256: abc71b4ae658e37fd0425e134a1a9d1ddadbcbd858fc1435476955937c038785
font_01_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 10760 bytes
SHA-256: f7e757be12b980e8cf7af00f498cabc2414d10353974c76d7da67e62a0d49dc9
font_02_sfnt_off00014dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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