Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0852c59ab6eddb7…

MALICIOUS

PDF

94.2 KB Created: 2021-09-21 21:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cd1da58fc131f7c3d0f8456921cb184 SHA-1: 53a46e275cdfee43a55dc33f6bc2c46846214e08 SHA-256: f0852c59ab6eddb770c1bb547ccd9ff4b25eaea650b7d2d59dd0e7ce9168ced2
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to deliver a malicious payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/69495649498.pdf In PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vopiteda.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/13393019049.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/dutowuvebigube.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/1853626452.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/bodupifejineleredajumax.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/fegiga.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/34637980936.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/24860033883.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/96466346411.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/paremovisu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nudanufi.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/mofezefoxibawavilobap.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334b689f8e---kijotusizugedelet.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d013d9b819d547ea603f239712e5a4d4/76195649100.pdfIn PDF document text
    • http://grabnerestriche.at/54054790173.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/nuzesokumufurepikof.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/85672300014.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/92587514971.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0177299001630709969.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6703405994.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce9f45987---11095255748.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf3b5aa2a---1996665655.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130dadf6f04c---41274092342.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/dexuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=demon+slayer+mugen+train+full+movie+subbedPDF 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_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 20660 bytes
SHA-256: 4fbc89027ae1431ad6a2e1a6d8e83d1ce11edfa9b53b9a78973d35a611988d60
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 11120 bytes
SHA-256: 86d64387eeaf994bbb30e7833bcf77e8dd1e737e792f82486252130c59c112ea
font_02_sfnt_off00015279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1