Malicious PDF — malware analysis report

Static analysis result for SHA-256 487cf6c15ea5a90d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 23:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 610fb22c884a98f82ea6c6b97f57adc0 SHA-1: 45ae43701660eb8333f916b2e018a93f330a66b9 SHA-256: 487cf6c15ea5a90d34db092ee1c629b2a9311a0c6dcaeab6072a4a21e472703d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://rld-carbon.com/file/zobujal.pdf In PDF document text
    • http://imosa.asia/uploads/files/202109070332407822.pdfIn PDF document text
    • https://ms2oke.com/contents/files/tarubexomomodowaniwomepa.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/60343017421.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/tibakenisemefijuwemag.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/59232208853.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/figipofexanakuwekazimoga.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/93461479221.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/56421616514.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/nudeligusi.pdfIn PDF document text
    • http://cichanski.com/Upload/file/batemi.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/ruvajivuwagigomivi.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/26902057374.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164532b9fe---53864076406.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/84762242237.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede1e9531f---46988592035.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jodofi.pdfIn PDF document text
    • https://felicityokolo.com/file/47907277129.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/lufebatakaj.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pemodulutopilagib.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd95e2938---54162664474.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/79240733150.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/zikawuxuzafozav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0543ef4c---vajigibusetoxaxumare.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/34408607569.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/ripexulirevudefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=grocery+list+app+androidPDF 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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10660 bytes
SHA-256: 02cbc4e7d7feb9b4facc152e10bfad9d41d84c15c5daf9905dab7c3c3f0ae53a
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 17672 bytes
SHA-256: 3626c329e25a81591e2342f2f966389e6ee5e311e296d21f0891563934ee491c
font_02_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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