Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5400ea2378b5a13…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 06:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d474ae2ae76c8795feb3688a46805bd SHA-1: 6d877e2f640abbef88153ad698262af97a78e607 SHA-256: f5400ea2378b5a13dafd41f528ab45d761479ff995adbfa79e9c6ba3d1dba901
156 Risk Score

Malware Insights

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

The sample was detected as malicious by multiple heuristics and an ML classifier, specifically flagging it as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607287fdc1340---16797702194.pdf In PDF document text
    • https://vandolderskb.com/images/usr/53858780692.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/37481996507.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160716d8699074---ruxuvemekexuzatixadag.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/podegas.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zokavukutenusoxav.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/bowafujibuzuwu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d08255a4e---suripapipusesanij.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/nikewiras.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wopupobuzepidasoremuwirum.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/13734712071.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97fab07f1---lavamixipeti.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbac31b5e---poxuwofuxu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084caa126e2f---tejozusukizetinakibexizoj.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/20804920425.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/35270fa072604724ad4bbb7cbbcf52e7/wolikaf.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7af1f22241---lerafibapunososewir.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/8235391062.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0c908cbe23158c8a47f950dfd4924a00/fefabemeporanovobow.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/43444354439.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68e27cb44---mejek.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3dliq2ovq37imlotjo4rot79v0/4415214257.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a004ab76e2a---12255040035.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/63434352126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=automated+manual+or+automaticPDF 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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10444 bytes
SHA-256: 90b8a7a6e7e40371de91ec859ccce139729d76cc12a8dba3f2038b9c8a84a8ab
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 17180 bytes
SHA-256: 7c64967ffa873a916e13fa2ad59f4ec82e18c4713da3f15fcfb536722ca5a421

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