Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1391e16aaf3a81…

MALICIOUS

PDF

107.9 KB Created: 2021-07-23 12:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 01f4c425f28706b27d2a6fcc2358634a SHA-1: 4d687f7ab8e301a84f364974582261691ba56a52 SHA-256: 4b1391e16aaf3a81dc1ce26e7eaafdc92de62dd553049747289226e549bcd1dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb58cc1a2---vamutibosudegurik.pdf In PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/25963292178.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/354bca7af77786239f813c4974ae2f3e/tusosageku.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/tjcme66ri661mrdvp7taveiuap/35443012864.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/20345901811.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/dapepelovemajaru.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/lunafugigugot.pdfIn PDF document text
    • https://everestart.com/images/stories/file/sotutoxiwudiki.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/78830727109.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850af24957---ruzagunejabaz.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/luruseboguwasafaro.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/52953396652.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/27872648680.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e983043f9---rabimiko.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9619e7410a---68089926445.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/24199340008.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/15501256056.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/zawoso.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c2280bbfb08756c3aca69e7031de13ac/50702933802.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54479423153.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd330894a6---tutaka.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734b0b6a6c0---10842592529.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3ac9cbb5518072540c1cb2735efc053/32431769330.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/sigimeravitegavojivupegu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/60326328009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=differential+binary+phase+shift+keyingPDF 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_off000142f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0D 10864 bytes
SHA-256: 433771e03594b40aa1d8728471426821b299a72d0c307e540c28d06e585b152e
font_02_sfnt_off000173e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E8 17216 bytes
SHA-256: 2f99d8d804bf30c34c923b89168f1a20835273303893ad6de26907ba6b05f081

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