Malicious PDF — malware analysis report

Static analysis result for SHA-256 05be42081561174b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 11:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9eae8cd4443d0e04b8e9888170024291 SHA-1: e6aecb29a1904248c7aea60ba91262b50263e849 SHA-256: 05be42081561174ba6540b342e7f1d8a950040a10c8887dc81942161ff3262ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on compromised CMS upload storage and disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dongshengcable.com/images/upload/File/56319860652.pdf In PDF document text
    • https://cplastik.cz/data/cms/file/74867713123.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/faxom.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/mirudaxopodogakodagudinat.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f75e891c4---98093711860.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b80adcdff02---jizix.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/mulatamidebuzazi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a04b7a936---31064719356.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/7874720702.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125dcafd2dec---41839894496.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/84141747815.pdfIn PDF document text
    • https://samudra99.com/contents//files/13850565195.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4eb8a543feeb4d6499c0977e275108c1/xitolepuvaza.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/21612287774.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tovilazep.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/kilafinejetujelaw.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mujoburezomeridokusup.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7f0ba0349---66188591086.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/32896679193.pdfIn PDF document text
    • https://lod.la/images/news/file/fexawurime.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcda278078---sivafakasimiru.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/6670728253.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/27725710704.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6d7c0c793db210423a74fb11b5bef6b2/38559293054.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e4c3a5f6---rudosesavaxonone.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/97510769676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=appsc+group+3+previous+papers+pdfPDF 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 17396 bytes
SHA-256: 1416a9f5731aab99c43b30c209b31d59d5646c2ec577d77892f13eade8860c76
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 10864 bytes
SHA-256: 541d5432e42e0acb0d900f98534a8359911e1cc81b10cd2736c3ffe744d708f7

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