Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb48b750aedd818…

MALICIOUS

PDF

84.3 KB Created: 2021-08-15 18:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 459305c01ae0b7dba0ebe947ccd1c808 SHA-1: 633ce8ef3a1bd0c37f546f7e1e1aca85fbfd0cbf SHA-256: 8eb48b750aedd818eeb9f03bbce07d8c09bf956a2530d67b82f430a6f0effdba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://phuongsen.com/img-chamthi/files/98571076989.pdf In PDF document text
    • https://rrr71.ru/upload_picture/kasakijizofutabumes.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/33473600751.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070825a3dedd---lisopatefatujogalos.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/64294defcf7fad985acca7db4175087e/60091569791.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sarejugawejoge.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/mepuziteteropotadi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f12c1b532544a49988a50c45dcf2b80a/zaleworituginogujidekug.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085d957c7f22---zatuwukakufisigodatipivog.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082153ed9b44---kijifolugiraj.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/74q7sfn3km7h424n510afp6cn4/82483581683.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/penedimaxurilamokedajogix.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078874f4dbfe---51177518590.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076da0fb8019---kuduzeziv.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb2449c---gegadamifasewud.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ffp0e1jrdvd873vio1011i8t5/68233235553.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zevejapuzobevisa.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/66905845489.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/72589462926.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0ccfd1b10719f97be804949f0d500a2d/kozamuzo.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/66147553170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+a+porter+cable+finish+nailerPDF 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16968 bytes
SHA-256: 12f9a4d4df6529d6e6306469f8f307d0c3861b8ea823c0fe89fac409e0a8efe6
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 10892 bytes
SHA-256: 41c7d2abc8fb76f1c3b111256c9489b0153c4c3fcec9c75cb4634bfcede99a50
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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