Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb356c4e4b307b0d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 01:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8684b463d47278d5cf54c9c59939e2e3 SHA-1: 4b31ef661b8e16e46bcf4027351a31de00c3f90c SHA-256: bb356c4e4b307b0d0253f29a5ec442cac48a045ee406f51de1b7b20b4a529b5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and other external sites, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=credits+critical+ops PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc89968c4---wudab.pdfIn PDF document text
    • https://edarky.net/data/file/mavojodotuxoreviriraxu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614029518a42a---sanajasawobi.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/24686323441.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/riwuwevodubusobi.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/45557998390.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400a63c72a8---83276342520.pdfIn PDF document text
    • http://hejia-ele.net/upload/zirevozexari.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110830.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/763d3f5590afca80098fd1f76f991e5e/32225873347.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/kubojewamipo.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/wulisalubinikos.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/lupakasejugu.pdfIn PDF document text
    • http://semanbio.com/upload/files/38663230497.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/47598164216.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/50401864789.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fusizore.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/roxewitubelowawebekom.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mojexuguparat.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///pasilaz.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/29355217643.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/54482194392.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/tupozajevemodogixa.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/11456005763.pdfIn PDF document text
    • 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_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 17500 bytes
SHA-256: 5da319067af9e0bc72e12f3857b58565699651239c268c3523339b19e895ed47
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 10436 bytes
SHA-256: b30ebbbe1c45a50a3c11b657cbb7d866b2b7f8c126363dae6a94787b8b0ae4f0
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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