Malicious PDF — malware analysis report

Static analysis result for SHA-256 e488b4c04b780cd9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 05:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b4c289e72f1fd856d2384fc317147c1 SHA-1: c255557cb23b34a017aa289cae19a4208ab0af88 SHA-256: e488b4c04b780cd97382b9a318c800aba8157f4cb7e0417af06cd662f51cd928
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm suggests it is designed to lure users to external sites, potentially for credential harvesting or to download additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=how+to+forward+a+text+on+android+phone PDF link annotation
    • http://formel1vermietung.de/userfiles/file/jufejezejoraz.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/xosixezuxu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7009b9a68497b1c9671c39580a8b9895/43888690474.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/73776321755.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/finuzuzelexezexelododi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090417500242.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/kudulunolaxa.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/sofikelevolexigifavujug.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139432f34592---33398192068.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/69102343799.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wupuzeb.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/fuvuwuwilumafopumowi.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/pubogusale.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109230524503232.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/62375768196.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/5130328563.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908131219545741.pdfIn PDF document text
    • http://koutingchina.com/upload/files/wafuvuge.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/delepixow.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/kizopevavuxojibak.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/45374658995.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0a0bc8b2575668e9be7e04fcf5369cb8/kewobepi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/o2bcs8l3afv95klgkf6celg3bs/30980510385.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/41768384841.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 10560 bytes
SHA-256: 98c0882a4d044ee524b852a56b8d7e8adc3d48cd2f94b1023801de84386605f2
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 16768 bytes
SHA-256: 5ef983cc195080e0e9d40d7027619ebd2d592f807d9036c0cf08f8029df74aa1
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1