Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcf1d1a791f37db…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 09:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2b3831588ee5d23beb5490f8688da11 SHA-1: a7067592ae9173b3c7137bca22706c36ff31e767 SHA-256: edcf1d1a791f37db55c3ce539acdc7eebca1f03ba38a70fe0fa33e40e68db47e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and other potentially malicious URLs. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/20902432836.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b6ee56b4b0270ce07bc031ea47bb1ec5/191699733.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d959953e---kutudok.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/razidusenev.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9ab599a7d---popidebojisadupewabefezof.pdfIn PDF document text
    • http://lcxcable.com/fckeditor/file/piwodevawigagexevagerojus.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/ropezadinudibo.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/sixiluxirakuzatom.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/24445871137.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/jevefelutemufero.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nezajevokojuzekasi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/tujitawebepafe.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/26125948754.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i0mckqj0tcbaqon8drrq8k93f5/sopisebutadi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aeb7bc736ead4bde39567b20324db4cb/gisusunurubadozagedibixod.pdfIn PDF document text
    • http://jfe.hk/userfiles/sikenesolotoraxu.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/ridaraxijak.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129395826711---xaxuledeporexefibeka.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2bc7901155e9905663d908378ef2ca7c/12516913461.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/47524260232.pdfIn PDF document text
    • http://araonline.hu/uploads/file/balurimiwipebozabapu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca127f08---12722603782.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607878584643f---peraj.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a304658a---55101682270.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa0bd636a---bemuzajulimanulaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=electrophilic+aromatic+brominationPDF 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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 17820 bytes
SHA-256: 92d0b9724543cf7b278e5862b658f2a3b15b153f86b346571aff1181bd244636
font_01_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 10596 bytes
SHA-256: a6dafb4b37822c1ce14d68101e4d55e84259c81d297fab03fc63837e85801fde
font_02_sfnt_off00013e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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