Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b430bcfa43655e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 19:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73ad9818e6c23d3ec5d2082e43a35a6c SHA-1: 508d4fcabd54e0fb7f52ad4384ae429af862ec46 SHA-256: d8b430bcfa43655ecd449a466b35c5928f2ca706653b60944cc14fd4598b7f30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://alarouba.com/ckfinder/userfiles/files/32808638317.pdf In PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/xatig.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/47112633268.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/50424531939.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210714133554_7ogmmj.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6173077d1cee8180a779ec7a2bcbfdf/68677074842.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/dozexexijosogif.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a49999f38b5e32f2bcac49bf13afca2c/34568514771.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108b1b8d734a---51879749451.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/31123740025.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/fdc5e3cc26c73d133f6b04cf8ce6be9f/24931353585.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/37616824641.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff71fbd4a7---42210520311.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/18840275678.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109031532224528.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/57945347143.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16102d07dbe3a6---dekoregeziraxevovimij.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/53622781431.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vagomikogogolafiwetileta.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/kojolopujaguvogurotifivo.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/bomowitovuvafolewimer.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/kepolivumesowi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/88585992186.pdfIn PDF document text
    • http://houselandia.ru/files/dofotorujajebenemorifiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hematology+clinical+cases+uncovered+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_off0000b662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB662 11232 bytes
SHA-256: 229e783f78435c38143b79d3712945b2f354994119cea3c9497be8317730f361
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 18256 bytes
SHA-256: 60735c38dcc571854711260ba8b79a04d795f04ceee0ffce84ca92c3f67f305b

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