Malicious PDF — malware analysis report

Static analysis result for SHA-256 9280970d400725fe…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 10:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27301ae885eb5cd91aabe67d906add12 SHA-1: f97efd6ea754d22d05ad9de5dc2bea11a1aa23f9 SHA-256: 9280970d400725fea145028ec3383f487b8ba3eaccdd47085884699870239d91
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The `PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM` heuristic specifically highlights the use of compromised WordPress upload storage, further supporting the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://innersolutions-uk.com/file/jidamaga.pdf In PDF document text
    • http://khacvietlaser.vn/public/images_news/files/reviraximuruduv.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/voxegasefazozojuven.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/15510832083.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/67678490906.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/widoselaj.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/dixiputefagaxumefu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/lupimowe.pdfIn PDF document text
    • http://ppp220.com/Upload/file/77383766674.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/290e7713128a9bf2b3a0aad642aad4bf/67862155120.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/segitigokupe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144b7a938bed---vibuzilivesilefukadan.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3035f019d---jekugaj.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nakob.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sugiwuwirope.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cd067ffb543ec35957828ec68def0d4a/xopuposamikarore.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/14096357217.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161302182db36f---gumam.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fe3d784e---samijuliwo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b950e467960e5d782538d4baab0be740/xamuferedoxubosoke.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/voxununelenil.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/34456297870.pdfIn PDF document text
    • http://ruresept.ru/files/file/36477983214.pdfIn PDF document text
    • http://wenxuezj.com/images/File/81977307599.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/15205174388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=daily+note+apkPDF 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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 18568 bytes
SHA-256: e36669f8bcbc405ccc812bf142c2561619612ceeaf934d2b7db9f30a0f9711d1
font_01_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10184 bytes
SHA-256: 03d4773d9b81da6c59a3ada404c4062a6547343cb45fb42ed638ae9236aeceee