Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12f7149852ba5a2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 23:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2058681606ead9d00f3e32088cc9a67 SHA-1: 29539f7326add988fe5f7fc415a4cbfc4b15240a SHA-256: e12f7149852ba5a2de51c4912a03d5f5c71edfa7827129ceeef0127ba371318d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://german-ex.com/images/blog/file/kemawarar.pdf In PDF document text
    • http://bloodfaces.de/attachment/file/43880358174.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e357839bd---xagebujiruwokubivefilo.pdfIn PDF document text
    • http://bluebossa.pl/files/file/66617829761.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f682c3648---43449561990.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613878af69df6---43910218519.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/sogudebupakujusu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/87934040105.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/dojeked.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vodajezivog.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/60337855463.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hem02nnqbb2q5o511a8m21q8n0/tovosubofux.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/vikedi.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/xugitidi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/binigobudipanemaxunawina.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/51717331326.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/buruxu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/99322403998.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/4665267729.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q6t425239tbq1nqskp8udqv4b4/25062024420.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/muredosejujoj.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/tuzirotuzebagulanifidove.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210901133102_n7bo0g.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc2c5268b---farumakepeditegido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+android+phone+meanPDF 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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10604 bytes
SHA-256: 2c59cca82ebf6153d59791df5063d614312fe24ebaced41181745d3a5768244e
font_01_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 17796 bytes
SHA-256: 3e53c1818fdec1666ba16b95780b906ce1ab3b60fc63674cc8b028db89b7c378
font_02_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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