Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b313a7841a6724…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 03:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ee04a19a49c6e28a3fafa6f186f6df8 SHA-1: 0478a06cfd21958140c63b02dace60dbb475bb30 SHA-256: 09b313a7841a672492d83e7535695c8d9ebd23e21d6393003505fcd361f099b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://synerhu.ru/uplcv?utm_term=gta+san+cheater+ios PDF link annotation
    • http://alphamarino.kz/images/news/file/5347801523.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161514ff22ffe7---96358522715.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/vosururapipobuvu.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xivosabetawabar.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/wovegegatowaxamirixasa.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/29168837483.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/44295763578.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/turinunonutokixox.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/pitopigisamarokofifijagev.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/87950574066.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1eb90b7bb746ce97b09d8464e1046aa8/gamumapusepogomokapotiro.pdfIn PDF document text
    • http://c-amc.com/upload/files/sefemofefujevonapapas.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210918214734117.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2899ba888---95106727118.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614655a5201b6---12755889076.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tervrcngdths2mmgm8lbd91e93/zotijonuxonipibanovafega.pdfIn PDF document text
    • https://mklaassen.nl/images/file/26388608760.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/sexevirebifadoron.pdfIn PDF document text
    • http://cascad-trans.ru/files/15172311272.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/dkdrsb81qcb4g1pn0n1495ne14/zuluxanumamugif.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/luvejefujusapes.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9d282c50ef432951b767b81d5eff4047/66659973965.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_off0000ae57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 15344 bytes
SHA-256: 58f6d4a356f020afadec63fdf970d7d1708365585dcee65c43f7a41b375e553d
font_02_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10320 bytes
SHA-256: ce925051849180fa26ddb0f6ff5dbe31a53ad83e2c4a80cbe194578bacf4cdbf