Malicious PDF — malware analysis report

Static analysis result for SHA-256 896a15f74f13fa6c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 09:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8cccc71ec09a2ebf2082cde1b62e56e SHA-1: f53ccc42918923a5493a82118430b827d731a306 SHA-256: 896a15f74f13fa6c5de1484fc4f8045c1b83674cd335308530e81423aeb9008f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple PDF link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94363406707.pdf In PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xaxuliritinevogid.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/posewofividat.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/64768612255.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/roxizepowodugizowiki.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/992e9d2e4d319a3867f5f40807f4176f/83213002425.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fb4d512b---76750885908.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/53149211318.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/54829013418.pdfIn PDF document text
    • http://flexa.cz/docs/file/50895858407.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/99033875261.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/95841486017.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118e25255c---falamujixikenebivexuv.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d306062233053da4b2fe1a13c85c4e1d/28892215562.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/49379438577.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/58559702719.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///joforufexunejerugoxep.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/zereviwakexaj.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7ba2667c24b41ad65565bcb2d222ce16/kupotafufigesesizegidef.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/wujelekulagani.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/zebizu.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/91344038032.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da0417c311---dawetoxulubovetidobata.pdfIn PDF document text
    • http://okun.su/upload/file/93706654518.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/mikapi.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/tatofuluwanubumar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ml+aggarwal+class+11+trigonometry+solutionsPDF 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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10916 bytes
SHA-256: 3f109fff6e67e2263c3fbb62649b1bd08a892fb2eb0f19078a0c02ee572ff694
font_02_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 17812 bytes
SHA-256: f259e01f5db8a9692340f8512658db9733867e8540d7f361a6bf8ee914d63e29