Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a9aff338d5a46d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 15:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05e13ffbb99517122f2b32636a10a481 SHA-1: 7543800096743e26fb6a0b01f2533e54ab84b28b SHA-256: f9a9aff338d5a46dba0ab758b09176da227bc3ac8609bacb4d1e3cbd2fc242a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable domains. This suggests the file is part of a link farm designed to lure users to malicious content or for SEO poisoning. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vitaminyplus.eu/files/file/33315879807.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff1fb69b1---72605340961.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de099481982---54852138645.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/77939092673.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cedc0deca69d38e0cb2fd51b7ca156bf/54600468403.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5388f1b8---siritubir.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mapunixosuf.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/zijekemogidowejowam.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/sugepur.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e86fa92e06ed2785c275e5cb53205ce2/83101116903.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xexakewumasodeso.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6ad1693cfb058a2522ab7fece657e2a4/tiximabeso.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/63de2211018af55abcf28a0d63df2c82/finafejopolezetobuw.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a3c0510f60c54a3a8aecc8b5496b4b23/lerasofupamenidoguxaluko.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/75341303490.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/850812707.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd25354cd1---dibevekaliragatizamuxi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bfc4e047---tironilut.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/nezemebetugusolafajuvodig.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vcptuc49qn5o19vn0u4ijtetk2/bozunudirezatezerekire.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v3jg6it22g4g1m8qfrt64h6g87/92293340215.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/dilotimexenufuzesexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mint+jelly+recipe+for+lambPDF 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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10852 bytes
SHA-256: 18624d02e0c28e6deaa1a3590b6ef6da71919d8690a0aa2ce7fc75a6752e585d
font_02_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 17220 bytes
SHA-256: 9ae80709821a201bdc914292f203fec439b83eae5756a0af261e1d48931a6bb5

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