Malicious PDF — malware analysis report

Static analysis result for SHA-256 d077d06f6f66109a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 03:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 171354cafd9b59806330f3c85dd47b6e SHA-1: 621ba20aaef442e0b7d733550b33e395afd5262b SHA-256: d077d06f6f66109af0b7004200f0cd0f179a79079846cca499eca4e19b209b43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and link farms suggests an attempt to lure users to external resources for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=golfing+over+it+download+apk PDF link annotation
    • http://studiopignotti.it/userfiles/files/50453563609.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jegabo.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/lefamugozapiw.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/57683879919.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/10037517133.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/dutow.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/53060558909.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/313d56f7571537bcf447b94aaa819ad1/58859284734.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/vumirozexileku.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/65926785260.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/17383203771.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/52153dddf8d693d2946668fd31055868/55489680269.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914020157842875.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/zuvofinopob.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/deguzupibobulima.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/5809196341.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84965708246.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/bisujujuz.pdfIn PDF document text
    • https://digireg.it/upload/robozunumedajulidiwasewi.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/51283381046.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/falaxin.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/zenosoponigetozezuwoze.pdfIn PDF document text
    • http://entrackintl.com/uploads/89917090511.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/fifemuwefekenikixozikutis.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/849e36f14ce0c0af10d43cce27757a35/88611865023.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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 18336 bytes
SHA-256: 97f7b995687fd6531710b7dd0d33676bb4f618283691c0404565db6dc12b5dd6
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10788 bytes
SHA-256: 31c995092a59ae875b2289333aa40e666b9587cd208e3789b6c11b7bf0a9908f
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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