Malicious PDF — malware analysis report

Static analysis result for SHA-256 29510c615d2e3ce3…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 13:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f63d782401c3c5bab9ad97db2ba81108 SHA-1: f4491409fbadcffe466156ebaf90552a575fc712 SHA-256: 29510c615d2e3ce3506961887d804e0eb7d6b25cbb0c7df6fd0ae93c6d8ebfdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The embedded JavaScript is a common technique for initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dancephoto.ru/userfiles/files/33615173322.pdf In PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/kavasoganumufupezeka.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/mizuwugujitoxobonadim.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/taxuxupa.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/1529191303.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/sedogunijamokikitizi.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/97945222448.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/62632c10b80976a6ebb770533da4501d/wosawogexeg.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/80284928359.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/75462044588.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/nugiberu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wibul.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/13635577880.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cc7699be757a9d4212db70069842e83d/45489352022.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de94247454---lagasilefonunera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce52c3dd81c---52194948860.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/laxarafepe.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9adf6c914d---57569531558.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/4364220971.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed3bab6f6---wefivodasu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/76981518800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cavendish+experiment+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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 18820 bytes
SHA-256: 95351fc5abe9abd7cfaa82d27dc59e4290a2b5307027f5e053f1b7fa2dacc191
font_01_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10796 bytes
SHA-256: 16f227c9a74c783b1204eac4388a20c9989072c3e89ec6aa03f6e33badbb64ed
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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