Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ccb0b273ae05ea…

MALICIOUS

PDF

106.7 KB Created: 2021-08-11 03:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c31ebe12d15187f49287d702f2c58db2 SHA-1: cebe4023c46c0ebf51f9caf9a044bc91a7a69742 SHA-256: 40ccb0b273ae05eab2c8a019dcdb803c6f9a74505d61023a1aaf97d7d019088e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that these links are likely part of a link farm strategy, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://arci-mp.fr/admin/File/50217630401.pdf In PDF document text
    • https://bostoncake888.com/UserFiles/files/pavelepunus.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/97808911031.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8c8a101842977da71ebdb5b7c2420b48/lepukemubipumijaw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea8a66da4---73579335051.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zuvizabevenorofobobo.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210715165958169.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/72628863157.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dujinuzogan.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6bb29f6232eb757d5c74f6e8b754131e/49137984914.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/12030165337.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad864aa8cde---vepewafotasikuj.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/96541249700.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2401606e---6934608881.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0b982d0b---39679032803.pdfIn PDF document text
    • http://ozari-ua.com/files/file/72507893038.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/75855674784.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad7e6e084---35352338912.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/62754556989.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b53d94cbeb6---15819141227.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/koxegimuvuvabofibikepomad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+naruto+ultimate+ninja+heroes+2+ppsspp+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_01_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 11036 bytes
SHA-256: b9af812b6ad2c747f697b50aaba34e2ee0e3417665f4e016b8a467b491db8d10
font_02_sfnt_off000140f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 19752 bytes
SHA-256: 37d8895627c16f033fafe65d7709396c4f510bebb4808026e0f3cdf4e0f0ffd0
font_03_sfnt_off000173c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BCE 3928 bytes
SHA-256: 5b5378d885c8f2de04975cdfb7482bbf4f80ab1913eb2e2bbc769e067cb30eca

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