Malicious PDF — malware analysis report

Static analysis result for SHA-256 028703283dd51948…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 00:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92340e806cc53040aa8b0b20cd3e8a84 SHA-1: e0401c1d2bb9fdd9d1e917811ae2bc4bb57b42db SHA-256: 028703283dd51948c1213da9a29bb20bb15e3d7687679a08ff3692e743c9d4f0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to PDF files on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://sireny.net/share/files/pamafojaginefipuvurelilen.pdf In PDF document text
    • http://www.gdchgs.com/admin/img/files/51765590363.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/68674957106.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137551f79646---6450787231.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vaxena.pdfIn PDF document text
    • https://ptogel1.com/contents/files/92874535219.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/negubufojigog.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/47443342278.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/zefogivatoxuk.pdfIn PDF document text
    • http://snsi.jp/image/news_file/garegirafimaso.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/fafimokenuluzoteko.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/52030827784.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/mapitazinuwosugumibumati.pdfIn PDF document text
    • https://atavio.ru/files/file/28236161150.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/228c6ced6ca355de829b9f19f24312ed/radozom.pdfIn PDF document text
    • https://korankertas.com/contents/files/68523683178.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sabovonoguxununugarad.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/22442369946.pdfIn PDF document text
    • http://indexone.ru/upload/file/49214944656.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/jemepax.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/xebolewili.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/69038117177.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1ef49c1f01f5b8ae25fb636118eff1ec/naradiwinedope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bluetooth+fix+repair+apkPDF 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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 10532 bytes
SHA-256: 705ae901b4970cdefec51ea7c3960b4898f0c34d39dac700e345823cfe160d7e
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 18096 bytes
SHA-256: 4897182f83652b8ca0dd88d317fcc0c7fb8f274b9ace9855637ebbc9e4b32450