Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e128b2525fcb322…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 04:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c8b9064a584690740885306332e3f2f SHA-1: c654dc363c6d0e66478dbd4284c3ac2128846fbe SHA-256: 6e128b2525fcb3227b9599c5fe03a8266968bf56e391c47ddee7b2ba471531ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dentalrud.com/userfiles/file/simifopomawigeko.pdf In PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/83903002065.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/givipusamifazav.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/68033535872.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c99dfe0bbaec1f21b6c36db04e1b0884/31889882212.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/mitejatera.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/fakabetonizawowetinalux.pdfIn PDF document text
    • http://ned.ru/uploads/files/59875914151.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/sutukiridaporutugilifi.pdfIn PDF document text
    • http://agrion.org/upload/fichier/95038819433.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/4343156852.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/revafadelamujegogavifig.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/direnamez.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3b44bf65---94687861410.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/jeleredutolaganegovobasin.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147c03ec3fea---riwigikitiwenet.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ecc2379bfd36706c105245bc1370e832/5087471119.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/42462091831.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ab1a182e---86163901200.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/nokekavumibaboxemijozutit.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c76bc7ae---66222325552.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/30071428553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=paper+animals+io+onlinePDF 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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 10316 bytes
SHA-256: d586cabdd99a1066f5d9a947cf5a15fb20157e85015d493996fe3aa9a1c3556a
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 18448 bytes
SHA-256: 891c6f0d359a316cd6adc41a8057b0cba13c5e9e4b7c0f0b3787e5b332b6503c
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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