Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5121e99faa3f6…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 03:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c49984c404393c2583075382ab6e02f0 SHA-1: 24e21f52239f873c97d9ec21821ad4f595a451af SHA-256: 4fd5121e99faa3f6a5520b373667546bdb369a14c5c00cad02f5ea4e3e59dae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of numerous external URIs, including one pointing to a compromised WordPress upload, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://satesayap.com/contents/files/54506054295.pdf In PDF document text
    • http://dawahcity.com/userfiles/file/45138602047.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/54c690b55ef11842ceb87fe1236eb7c5/tifokisawukofarivipikawis.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/jenowikesugevu.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/muzovegazuxoguzaxozisaxo.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/39014565829.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/86428220246.pdfIn PDF document text
    • https://tch.lu/files/files/73288504023.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/sagimataxatazomizenud.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/64b7e5f419ffa2efc55b4d46a45f04d5/25431743265.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/41975825668.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/74557067440.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/rijenetafaxepapevene.pdfIn PDF document text
    • http://innotack.com/userfiles/file/21806206979.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/gavetubevijal.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad2c8981---37399592643.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ccc12bb1---28724855507.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/samoribejasasizadosubib.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zififilokorovuvulipuz.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/gadibimanerotez.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/7982437781.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/060920404039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=alotropos+del+carbono+pdfPDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 20316 bytes
SHA-256: d86c8cd44e06d00548efe4908b89b632e5ab202d45ad6893192ff719bfb540a2
font_02_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10644 bytes
SHA-256: b592f6bcd23c6c6a2f881919bde1f9b652a944340a01d9f44ea8cad4285b0159