Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd27f87a18e3e8d9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 08:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa9a3822dbaea7686fdf32a31c5d4c89 SHA-1: 024a47cb0b5333937af78fc549176d091bfbe527 SHA-256: fd27f87a18e3e8d9108840b9e415382d345c3805de7000ed26a6da180b336c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://handsonmontessoripk.com/userfiles/files/89316900961.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/10299631646.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/wibemabawenazapok.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/fowijeki.pdfIn PDF document text
    • https://capecoralliving.com/media/file/waperisereniv.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139658be411d---nekenuwita.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109020529552641.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169f2136d3---resemewotigunapu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136822dc76e6---9207536598.pdfIn PDF document text
    • http://mebco.ru/images/file/10906764833.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rogewamejobupezorobafif.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/magomivagotukuvimazede.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/lanonoxa.pdfIn PDF document text
    • https://lordoptika.hu/files/files/63821007237.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/61855651144.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/44216728557.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/47635921793.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9d712500---32426404224.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389730a4cb4---meromo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dcad4dcf297961df2013da351c9162b1/96356591144.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/20331521979.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/moxovikizokuvax.pdfIn PDF document text
    • http://sushibelovo.ru/files/30590334490.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5063d52c2---54943093685.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/xuvenapofukamusazizusib.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/38432267527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=eevee+candy+hackPDF 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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 10100 bytes
SHA-256: c63dc46709290dc2f6e3e54eb6fb254281d0597fe466e365e91dec0afbeb8cdc
font_02_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 14212 bytes
SHA-256: 288a07b605808287f0dd30145f0b75d63fb54e8d1ace22defbcf757422f56f86

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