Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d0d76c9760a393…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 11:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2997e891893ea45bdc2d2d4a23581c7d SHA-1: 6d4390ebc22b59c9edf95578746ad5483775754b SHA-256: d8d0d76c9760a3932879dcdc755c97f14d101c3a7c4e4c7bf0fb2d1563e20f6d
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zulassung4you.de/bilder/file/kujuwamejupumikobetoxira.pdf In PDF document text
    • http://www.blueoak.fr/image/file/joxulexigazapet.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7ab425f2353e8e26bef25af9fbb0c7ba/daxejijebunepifevavi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6ae0e8b7b81e8d7373b904debfa11cf8/jedamaneratepuviketivimi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8eab342a9cf372deb54af0814c624fb4/supufuxeb.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bbf74295---puloginizidaxafudugit.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/41934470396.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/96837125702.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/21401284f91306ceee62a910f2d88e01/93272332362.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a306b546ef5---87523302106.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/88669509200.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/59204daaad739f3025c1f6b890a4d7d8/89996679589.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210604_E206D64F451EBC06.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/85747706359.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/99211761072.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b79a821d---jukikum.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8bada3dd---23955199032.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b301eb355eef0e584b6ab2b17c7fa6ba/49845547637.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/85804861610.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2ceb9a8362792e581a280a69efad800b/vokoloxovuvaxigegogefa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf41d8509d---wuzofo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732a77be3de---76368337646.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/h7kto27haobfnh8hairj06vcjk/31530517851.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/nolimuwaxidofowexukakus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=heber+city+hot+springsPDF 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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 17496 bytes
SHA-256: 44c512ab67fa6fc7033d2210969dcd08407d187aef24c4f3bb3411e8c1206b07
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 10692 bytes
SHA-256: 8c6a9f3e1f39383720d1325a0752f8c4b33a6ff89d4fc13a412f46f5fd22c439