Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aab2fb0893a4b2…

MALICIOUS

PDF

79.7 KB Created: 2021-08-21 20:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 76f2b35465c2d303223b46a14cdcd602 SHA-1: b15ec9fa329aa44bd3157405d01b31753008500f SHA-256: b4aab2fb0893a4b2b119efe085581076bff9c882056b03a1c25e0ea4be6eedba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=tez+%C3%B6rnekleri+pdf+indir PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3be65a85b1fca96dc99f8c1433bcb75e/rorafinixom.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/58035706698.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/38355218667.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ac2a94c0---63411793443.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad5be5ad2---penamibadedamafakiza.pdfIn PDF document text
    • http://unseretochter.com/images/file/xolebaxorizepiruj.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pulapexugu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9822acf6---votuwijudukeresijomonukuk.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/nh31g8q6ggijs0a6doj2dnfr62/sikorevem.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/nevawufetisuxet.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/31c84b56e4974d76c436d8634f0a4537/41215601258.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/19104015657.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/wagiluxuxosase.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/mitedenevujunusodabi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d198dd7a681---jerelonisozurapopenosumuv.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1be7ee1222603f82ed8a74c4b1e9f1cd/28851567209.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/64833423553.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8r8at0208smn7pesdb6id887jq/domegufobeviv.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/rirunimodazonag.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rileva.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gijizesurerofilezokevuma.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620547920.pdfIn PDF document text
    • 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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 10272 bytes
SHA-256: 89cd1386c66d6b2f7107ecee9605212fbb0084d1ac27a8f29eaa5b6db94fdaab
font_02_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 16920 bytes
SHA-256: a9113b2d0ac6813ad83e7e9d92ad969afe77965e63c29e4b6e749ae7eefcc8a3

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