Malicious PDF — malware analysis report

Static analysis result for SHA-256 04de9d209e30fe6a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 02:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c535e05ed1bb1de93f0d27366ffb3fc9 SHA-1: 8a8cf77828353a286c15067f165181374e14b2a8 SHA-256: 04de9d209e30fe6a78191a76de4e2ae2846c623d9182044a2c40dab1413923f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sensi-leszno.pl/userfiles/file/pegizuwesa.pdf In PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/paxavomovopobuwa.pdfIn PDF document text
    • http://lg-palette.com/upload/files/sipesutabubatida.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecce880c3---64323885420.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/vazafowin.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be900b866---fezixo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210920194848673.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/vakipemopufumutetotir.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/xamepibujeluk.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210915174825.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kurapisuzupuw.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/77045968452.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/67815486242.pdfIn PDF document text
    • https://melz-feu.ru/upload/kakokur.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/49704085029.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa8fae08b---kerinitufez.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/turubagidejojuzebexobewa.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/21248022503.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/pupibagunifalomedafu.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xevidexavemopugoraw.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/nilosikapesasaduje.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/63972416218.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/53232255593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+plain+wallpaperPDF 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_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 10184 bytes
SHA-256: 6da437eab8c07be93b89394b6165be8de62a2606ab8be29316d4abd1782595d0
font_02_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 15296 bytes
SHA-256: ed5fe6c1fe0f6a117c25d78547f37f6ed756f6c3a67cf8b9df07a44e42aab1a4

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