Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acfeddcec33dfaa…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 05:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 358ddbf9f6929d8578afddb372b399bc SHA-1: ef66f3ceb6d1ea4b72b801a0369fad48be2b89fb SHA-256: 9acfeddcec33dfaaa861b58f49b6b65d9e0f9767a09f8d7e6f9fd6aa3afce8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/umdsmvrr4mal2u1vd227t74fa2/wugajexuwidizagezuxufivux.pdf In PDF document text
    • http://khacdautron.com/Images_upload/files/vopuvoviw.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/5995127982.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/wisarupafixufarazedo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b825912b32---31958926500.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a1rt670if25atidj807mvvomn7/70324496323.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/51160958615.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5a859ef1---88865165952.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfe33e0d0---32460374434.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e1523e7fmks945i8eua9njn6m5/sedutopezuzujadezorolone.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/35779363122.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/xujorepuwog.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/34251585683.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160940812d6f4f---83975037484.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/87857347003.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/99656558828.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/denexojebajapam.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1a9948c1bf7f0b5e45ac7cd44a0a1a88/bebogunosokelowasi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/lukililiregedudubuz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sikitor.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/80957549684.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5753f87733---88683045001.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nitifu.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/xorosorutugilukaw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b823ba5875a---42821485830.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c8d8e75b---17730746154.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/54009578722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=parrot+drone+mambo+manualPDF 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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 10392 bytes
SHA-256: 3a463546c3f24e9d73ef4dd41c04bed920dd6741d7a8200c42952c9c58a95f1a
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 17344 bytes
SHA-256: 2c6f8b52fda7a5bafda5b1cd51ac50bba1be2e03c1f7fc5fe15902d8fa33536e