Malicious PDF — malware analysis report

Static analysis result for SHA-256 115cd98a419a6a6a…

MALICIOUS

PDF

76.7 KB Created: 2021-07-04 17:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 37a4628b4d94b4d06ee24149863a2ce2 SHA-1: 9dce82194ab69ba0a8e359dc7830e2ea17489016 SHA-256: 115cd98a419a6a6a1f5313fdb1dc25010d188feb6c4c70a1a1bf65e757a66bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=the+abbot%27s+table PDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608509734737a---vugisozizavo.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/sudubejufiwenolut.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/67254308096.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fbrc5e7ku8ctod7b2mlke9t8ko/gunatijiruzaziwikozi.pdfIn PDF document text
    • https://allianztc.ro/files/file/94831987310.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca3c943ce---33676167712.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12a70df5d---lumazutabamopelap.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b8c9ac36---29240616401.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/722ef7900ae8ceef8abb43b0949ec4c5/xulilavezi.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/dutosutilabepu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796792d401d---66895076082.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/xetusitixonatazir.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pegegeroneki.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a369a472c1---mewiduripefanotepuxawul.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb59575d4---pivifit.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/61643728596.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/20592f2cb238d22e583a9e7f84a8cd3b/76469402928.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79fa137b2---5353103120.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105100541517938.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/51968e30adeed734336a3668f61bf535/gewavosi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0211c12fd39507aaee53834a5d4c36da/nerutileniwofuzeka.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb2f11afc---73730551488.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kakiwefadonukonudifu.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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 10048 bytes
SHA-256: 9ff75e795fb9976b6f3e5d736bd5bffa12debf1a41f01e6c9e2be930fdda370a
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 17608 bytes
SHA-256: 8f4fa3d098146ae6196db695adceec790c255f5d588fe6bd53b40658a82c81a1
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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