Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbade4b204f2b0d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 22:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4a619c215de241228fb7c61219ae193b SHA-1: de9fcf1df810f89ec5dd471aa1ed237f17c3a874 SHA-256: fcbade4b204f2b0d17a9e6fc730355cee8fb7113e0bb34f3345a79ca691fe138
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 0.9846

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://irlanc.ru/uplcv?utm_term=fractionated+and+unfractionated+heparin+pdf PDF link annotation
    • https://arendic.cl/files/sozulasovavemapapipuburo.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/roxotado.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/88692369067.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b33bea18---56475894519.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/22545606066.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/bupetewuvurawapejoto.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b48caa3b3ebae648d1fd9b56524026e5/27898882355.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/49563618553.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/50666442843.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wamofasifefaxeduma.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/375902109.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/robovezademuvenorajor.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/37753112576.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/361a4b70674fa52a3191cd2235208f20/tufemufaji.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/83785502814.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/29371580407.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823ed157115---3013432122.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/tezusidizoguxinirad.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/vilogaweleliwijepupufif.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gnfsbi1hplp0nhe46565d7qj1/xozibesosa.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/puligogifofilarufewit.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/ganukogitiv.pdfIn PDF document text
    • http://huiking.cn/uploads/file/300035526743.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/5869150658.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/91073149951.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e481b06f---51499627741.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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 17188 bytes
SHA-256: 439f9c62699e42e89037e85dc2482ca78d5ff57877cb7e1a5c36e9f6b3d04b2b
font_02_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 10580 bytes
SHA-256: ea376874e0dc91f4a2ab7fc36262a3c09ab2e77be0112291ee8b038e3aa6147e

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