Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f63e21203d93d7…

MALICIOUS

PDF

88.0 KB Created: 2021-08-04 00:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd0320df2e6e9f595a462ecbb15516c3 SHA-1: b5a630d20b95df7852221e955f2165754a291c70 SHA-256: 86f63e21203d93d71185cdaa3071ccd74602057ab03463e1301d9c0569e1d51b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3aa0bb2d3d28ee403c81cfb24356a5e7/78870960259.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/01fb13e5402cffa12f9c0a1669889d8f/rexemalabexikibuten.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/neluxirizeger.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17080177c---20247502093.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504101309357229.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/75179287336.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9a7cd52f---38915766292.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160887da091e16---18403791303.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2b2n24oiqtv3fgc4u5vqa4b8ha/fifowajewawi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11bdd832ee---gezonitupukeluwibixofa.pdfIn PDF document text
    • https://eventaipei.com/upload/files/zezewavosixafisijekok.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1beace00c6---zopafewanevit.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279b0c6ab9---bawutuzijapi.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xitilowi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/gaxatozerixapisativejin.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4dd15bbee---negosipazaziki.pdfIn PDF document text
    • https://maclashoes.it/file/runomodojiratikamirejawe.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/21167356150.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e652ea82---poriradujefebubasonapuwe.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/jovubakalixuzigajof.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f1dc7285d4b567497067eb905bb9391e/52191282226.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/32752257649.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t6hk3cffa077racvt74g5hevd5/fepetibixuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cbse+class+12+accountancy+sample+paper+2021+with+solutions+pdfPDF 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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 17076 bytes
SHA-256: 0f4a904a788a7989943fd47ccf7c336f8f1b92170f16f2cda7fbf3a760c38e3f
font_01_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 11648 bytes
SHA-256: 40b2ec131cf2c1211605e83d330193086e14dc0024409ec864995bf9e4d7714e
font_02_sfnt_off000138b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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