Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd291bf97273083c…

MALICIOUS

PDF

77.9 KB Created: 2021-06-15 19:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b4999b6d5d51c784328e0246f8d9881 SHA-1: 6dff70fd7274f7233c9a85915cdc951bb955e4cc SHA-256: fd291bf97273083c6bd8b456442b06cb61690f1cf7577648a61d9eb4f450590c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm pointing to multiple compromised websites, likely intended to distribute malicious applications or lead to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure for users to download software. No scripts were extracted, but the presence of external URIs and compromised CMS uploads suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=cinema+hd+v2+app+for+firestick PDF link annotation
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/03e6666743414516cae3c78dea008473/duputurawezubomonomamexaw.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0982d858a---rutixilepowunowa.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0253b2066---zosulijepepelozisepos.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/lud9kgu3ubmg7h23pham15bas3/3786288796.pdfIn PDF document text
    • http://promador.pl/userfiles/file/selopelijesetarame.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/majodanunoj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094fe457527c---parogotujo.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/55552701182.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/mizuworus.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d8528e57e277bf32570e0423941a38c5/foxidom.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/95062185728.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/kanobumilazedikefex.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/negevabiwod.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe83318acc---sarilonojufe.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/figomotefewod.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/ziwexepixitavuzikisom.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071323bcedcd---xadibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 5524 bytes
SHA-256: 5417744827aacdff75ab3c0c631e17928c9cd93f0836e25cddae61fa64663ce5
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 11196 bytes
SHA-256: 1a9df3132c1d683b2362af4a95b9aa29bf39852d7be12298b1581a2c70ea46e7