Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18fc35657d72c47…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 15:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 208446b61dc30028be3e8030d912a2d6 SHA-1: 9932e396aa542ac0bd51fd07c0a73042197c6187 SHA-256: f18fc35657d72c47c5e08f3fbd070a6afada3061003233ee5de218e2d978e407
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external URLs that lead to various websites. Several of these URLs point to compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://airconbank.com/upload/fckeditor/file/61459829026.pdf In PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/68266992977.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5e32a31d991b446425d922bf24e6bf21/kekezuwufun.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tezenubigikojobunapafo.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/dawidejiwanomexikesepisow.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118cab84a162---vugiduxiniwo.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/37085979750.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/7507l4ci1lt4kd62oe6jqdudv2/wujetulazer.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/17100639250.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/9427683324.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/li5nhdgvv85nmpoo13s944kmbc/tujetugaladurugijimaket.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s94tddfi054g70qb76dpsptltp/wiguwitunusedu.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/lotowatavevorexul.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a290679f8---10135718761.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/xemadinef.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a41238262---80274570485.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/jupisafe.pdfIn PDF document text
    • https://kede.org/userfiles/file/gujobabolil.pdfIn PDF document text
    • https://tl-systems.hu/files/files/14819307811.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf21d9ee26---wekejiwujinigomegap.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ec7dd7dc87e6824695d79955710db5c3/4866071814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bookeye+scanner+manualPDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10560 bytes
SHA-256: 7b1bd196893f47e6c2c9a8dd598a78e197b7570add8773579c209f7a254699c7
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 17044 bytes
SHA-256: 22609d901dd2534ad65ca84d57f9d5029d286e6f8d2a2a8b3a59688a29d7f2f6

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