Malicious PDF — malware analysis report

Static analysis result for SHA-256 287f3f86b081f752…

MALICIOUS

PDF

85.1 KB Created: 2021-07-07 04:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb006d38a49d0d0b5d349fbfe25c87e9 SHA-1: 44f997455d2673d4684c480bd0f5b81d761ce7f8 SHA-256: 287f3f86b081f752846a0d313874ee5e5bd48fb957f9074bdef17ef2b8222184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o03blrcf082quk4m9e6rks44up/47202840408.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc993becd---26273158726.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e21084d8---gadatogidawabosadokonura.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215241837258028.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d54d0900366---2014887435.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/likegijunurepazapiba.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706f968501a---fuzubevavu.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/rivepoguzumimixidujobox.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/77481553237.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7c93948607d8632709a56041956d2365/dalifaropa.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3lahdheg8hba3g695prlk6okc1/33625731163.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/22564252738.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/4524947223.pdfIn PDF document text
    • https://harom.ro/files/file/temitapo.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/10669590588.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed1da1d1e5---97576879758.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jofevud.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/losmnu2emo2fonnlisu9idkfc5/xetidugitexezime.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5d812e0a2b6307c53d639fc113a27f1e/88651930798.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099c84e40d30---dadusatef.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45db89c881---70502319669.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073641f7cafe---metoxufapiwopuwivebiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+pencil+drawing+lessons+for+beginnersPDF 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 17444 bytes
SHA-256: d7955d3ca6e297fa4beabac1b43fd087a763cf419de572f32f2b3cf02baf3075
font_01_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 10900 bytes
SHA-256: 25433017d5061975ce7b8c8058a25d8830acb4472b70ab527fb0538eff2b575f
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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