Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58d5f94a2b21286…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 23:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59b98d09ddefe9cac9976f0cd69d576c SHA-1: ea5eb934b4002f865a56c0282bea0bbbd79e09d9 SHA-256: d58d5f94a2b2128617d0fb600d961711b234e7d73140455e3aac48433ebd0144
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=how+do+i+get+my+old+wallpaper+back+on+my+android PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/nikozazudexulij.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mosikedekuna.pdfIn PDF document text
    • https://mimpidia.com/contents/files/tokube.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/44835286234.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/8906292144.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/popidotewuvoreziwuj.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/61106914228.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/67554691284.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614077e77bd9d---pigaxokojitezepuvagalitez.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161353c7d0f83f---47605115313.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-6/20210906140548633652.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210920_135020.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/29902150251.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/vebatujiran.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/22450971644.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/34774066348.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/5206860523.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/zawilariwuvugutogonal.pdfIn PDF document text
    • http://compsult.net/userfiles/file/moleromet.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8ea0fbe15b6140f5bcf667c57c459292/84095748708.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lusabizinatekulivul.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/pikibaxobapovovako.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/95321677312.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/33747783971.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/pezosuniwuvolajivazofobed.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/85734387627.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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 17052 bytes
SHA-256: cef644c0e4cc53a3de615d33ce23a4cb92781b8cd1f16ccb30251a3f3958894b
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 11112 bytes
SHA-256: a2a6857a260a1cb25ce442355bc824f552acf4971526c795015b17b9d6c1d465
font_02_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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