Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7de418898ef48c9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 02:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c82272fc170477483f32ce6b6962f4d SHA-1: a49d472acdc90b8e8acfc495c862cd32f13419c2 SHA-256: b7de418898ef48c9447d174eb66d743d1d9681bfecbe0c45fd909eabe58574af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to evade detection and broaden reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=350mm+to+inches PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a100f44cec---guweduwazidojobova.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e4ef0d55---bilezeretelek.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/27c522148510a27f713bb1597800acfd/36102567966.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/83156358060b10621927de.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee251c2dd---jerodawivido.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/rudelevud.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/xoxojemukibad.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b222e0fef5---tevimiriporegefeg.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/atrq9fpji7knlnnrk7sc0i05qa/tamexosedam.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/44318695976.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/44047565150.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7043d40bfc39826fd1d146a864fcfba0/5151067767.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/20005206284.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210824094759.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/17954537030.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4e01b029---najefo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160edb91874636---jideruzifadifutijowig.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/15118129573.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e396185b---35023583251.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/54205236093.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2606988b9---mokefenagulo.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/82575507502.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/zinag.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9633bd903---wogusomewew.pdfIn PDF document text
    • https://aildf.in/userfiles/file/35629374937.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 10520 bytes
SHA-256: 07d13067313c770248cdb4c4b2c2e218e35777d07162e043247859afb6b07189
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 18184 bytes
SHA-256: 85765785c2207014d64e6479bc7ffd33e9d740ca4d82b6f2a5432b1d06378b32

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