Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d86dae5e6f613e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-04 19:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecb31f516aa7f63a8fc60f3f52c6eb84 SHA-1: 4ed2852d4cccb305afc59dcc8fcbf2196af21958 SHA-256: a6d86dae5e6f613ecd3dd12b669d479adc034e33412458074e4abc0f26b91090
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 document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=blends+worksheets+printable PDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d4b594f50b5355b3d5adf2adc9b9a25c/nujobidexajodador.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/27131565681.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0e240ced---59582292302.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/97805311692.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7b0d1415---zisizajurenetixalawa.pdfIn PDF document text
    • http://newo.ru/files/files/59248561503.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/befunozuj.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/1701009607.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/11867847019.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/28411045724.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/78157321080.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/96816135218.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ddeb2984350d43097b3ce786d69da65d/xavipajoke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ffc90da74---42456772455.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/44174948297.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kugilazadijubini.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/794b74b749669da65c3085fd6b46a23c/vonugu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/juvukawunikuxeketudado.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/18c852c501be05c7de28e215a3dc6bcb/disuzox.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/zizososelajap.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/3728155997.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/253cdc4f0d9fdb294bad27f55df1be4a/31193447802.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f43cd6c18---vifogavivinezulofolebok.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zukudajuv.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/783f21bb1f48f0838563589c930c9c32/nexopupaxugogi.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630095193_670215e4f3.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_off0000b418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB418 10860 bytes
SHA-256: 72d9d0c296e99e18dc279da0e8d9a1804497e1dca7f023afb5d3dd76af80da36
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 14544 bytes
SHA-256: 2bd4a5e37df6c8e62affcb6cb5cbe66b28b11b3af8ec1806bb2ce0018b340de8
font_02_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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