Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5d8178f7d4765f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-23 14:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b1c076a79391fa777753855d511d372 SHA-1: 51308045e7540836d4bab045c066e0f6a7124bf0 SHA-256: 8f5d8178f7d4765f944bd2f35afc9af52d223f1e7d1f6a166bfd53ec6d0693c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oniceh.ru/uplcv?utm_term=spy+secrets+that+can+save+your+life+free+pdf+download PDF link annotation
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/12195429281.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/kofurajipovotileraf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161322dd63826c---vibuxinageburoxibaroketi.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/velatekugozani.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0225916997c97d746cbe706e9dd49e06/xidozuj.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/paruzimu.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dawuluzalepixat.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dawiveli.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148097db51f0---jijexidaruzure.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614343771ee78---78876412033.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4d49000dd---vebugebitoxowajafir.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/edf25f889e0068500fdb9afdca55c9a2/77402433837.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ece0a3fa4---xopidiwiporebimak.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/80776334523.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/getikajet.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/95503843493.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bgok5md8kb11g2i91sc77ij7rl/mosogodixu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/lasure.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/muzijemowisa.pdfIn PDF document text
    • https://makenie.com/upload/files/jejupodidixen.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/30417745559.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0919/c117a37776ae5c9c9f284aba9677e205.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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 17640 bytes
SHA-256: d2f6bf0e754f725af55cb458d1ebb2f087725ee62e3b3e125ba02bca5c94edc0
font_02_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 11156 bytes
SHA-256: 72beb574003b82536ee38c698abb0eb7615c0680488e8884c529640a5410b9de

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