Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb986f20f77bdd7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 19:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 844aa16ae4ce6f355df0ffc21b61238e SHA-1: 0591118112d0df6dc3a5d24f11e7e73cea311352 SHA-256: 4bb986f20f77bdd789bcbc4699f379d56cecf516b29a4029d48dcd389dc06e1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=bedroom+in+castle PDF link annotation
    • http://efrex.cz/files/file/dixawekedikatemub.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/jisazezuxofudopelos.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fusinumitufajebigavu.pdfIn PDF document text
    • http://www.andreapondika.cz/file/70941105190.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/00f48c8fbe23704c3316c6575496f222/kozojujot.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/powifasitokuwo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614590c55be67---zevumepagizojogoledi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613757bc25ac2---14098226806.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/taxajan.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/26444229630.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76227157706.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nimezapawamobix.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/baveradepivevanoku.pdfIn PDF document text
    • http://knipia.com/userfiles/file/kafarelolewux.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25896926105.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090210042812.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/rivokinokexixafulob.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b8cc5b82cc6588ff71272e832041cafe/89019504000.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/zugipagefiroma.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/13581441739.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/13945363414.pdfIn PDF document text
    • http://pb-book.com/user_file/file/molavivigeraju.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/93419987142.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/55704075487.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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 16712 bytes
SHA-256: f1142b297856689ab7bdac2bb22d7bc12a5017d7cb2ba195ba20ce55a8f8a8e8
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10584 bytes
SHA-256: 4c40e6c28ffa5f8b9a30bdf40f3b98d448418c62e04ca5a5834e7ac199400db2

Open this report in the interactive analyzer, or submit your own file for analysis.