Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d51c7670a9e35d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 13:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbbcdcd3b418406f14f7d864f94dbcba SHA-1: 1e1ddffd772051461fd17c9bf1f4c75d734a64bc SHA-256: 55d51c7670a9e35dc5c020b6adbc2d2c9c951f2b4776277d44077d5afe2926a8
156 Risk Score

Malware Insights

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

The sample is a PDF file identified by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier also flagged this PDF with high confidence, supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac1f5c33ecf497cd27c5dfb7cf4b6265/fekirilujumod.pdf In PDF document text
    • http://solemarservizi.it/userfiles/files/xamizuwaxawijexojuvote.pdfIn PDF document text
    • http://fittbikese.hu/files/file/57160197045.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/jizavefefakirupuzin.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zakozuxarinesu.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/peroviwapigegegazubimifev.pdfIn PDF document text
    • http://1carl.com/userfiles/file/remebowaru.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/61565155326.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/87076455327.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/17299002905.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/57001693761.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/tiwemovilopowavujobep.pdfIn PDF document text
    • http://princeverma.in/uploads/files/31204184353.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090209525211.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/31380844322.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/talotexisuju.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/46173109352.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kafuzewusokowokuzenoloboz.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/24368016082.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jojogepudoxoravoge.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e8e0d944afb879fc0b72efdd36d2d7c6/13704324856.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b97307b8c663de1863c8dbf40a307a68/kakinevexiwibififunev.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/99534346023.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/79928669603.pdfIn PDF document text
    • https://chineseclothingonline.com/File/63311722100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+do+a+factory+reset+on+an+android+phonePDF 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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 17916 bytes
SHA-256: 965e13b7959c8e807798fce67016416dee7f00330c4cd3c6ea9260edcdcca264
font_01_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 10960 bytes
SHA-256: 75e23b1869db8ac2c6c58ee544e5a9799d5a0bc52d6755f591a3ada9bae00444