Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d9d6c6f76474d2…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 14:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f0984bf31adbc309857fcec69a60a46 SHA-1: c68f9b1bc1b821d10b38b76786ab723fa41c09fe SHA-256: a6d9d6c6f76474d21388677dcb253daa74e116112dd6e3f850f48b5b37e7cdf6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cncostruzioni.com/userfiles/file/tatujojezupivi.pdf In PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/21670349595.pdfIn PDF document text
    • https://keongracun.org/contents/files/88422442316.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b375431143eb254da7b3c584e069d088/fazaluli.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/58673845616.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/9450175250.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/098572cc8704327855fbd7d4ed4b417b/15132485821.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367418e07bf---15904691844.pdfIn PDF document text
    • http://exim5.hu/_user/file/jilajoritite.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/15391818609.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/lekejodexabukapujeta.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3462ce1b6f6402754f40fc012209ed4/widur.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/5489346348.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lulisibirokimef.pdfIn PDF document text
    • http://inistor.com/ufiles/files/27190855811.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/29820118166.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/jelegamatitexofiko.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140974b87307---miloxedizemufofosu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dagopef.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/xamerulu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/sabodawalatusofabatu.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/pireriruwazoxewiva.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/4277797991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=action+words+that+start+with+dPDF 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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10356 bytes
SHA-256: 4e91f4c83dc16ef26da2c4cd51cbfafb3a22dacfd0eadb907a103c0d233988ee
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16796 bytes
SHA-256: d4fcadc8e17e1b0724f6e457516d5a5992d6b88cf469f4e2a5d3cad33da45fd9