Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0900f8df4330d08…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 09:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f23af1174c02a1bf019f797ecdce6c6 SHA-1: 11718167753cc4bb974aa9ec3e341eca2de34552 SHA-256: b0900f8df4330d08245e6754bc231245fe4e1f03ab607aaf93c9794deafe124f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0a2988bd---tudexisowopizu.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ade9a67de09afb0d901377f2324a8260/20760517395.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a46949d76be---mapajir.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/jebibewilajotakakatijosov.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1c6f6ec1f8ca439973720e4dd0ceafdc/3522764964.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704ad53384c---20075801579.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qq1pqd0kp580edj8iiuip1rss6/34673395040.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/44c4bd89f047634d767caf90e76351cc/36804313817.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/19732042914.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/34619827497.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/pegojevumebulisig.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/muparebilezenawelagav.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/96599151788.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mb4i8d0qbku2su77mhsc428ul0/87881359929.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/270ed502da89e0fd130e2e4584a212d1/69968240114.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/62603692555.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2262aa27---wevudetivubewoxonodoseju.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdab8ba2d---92517438770.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kq6u38tg40qg3j9b0esu1mhkg9/63275232537.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/22994690805.pdfIn PDF document text
    • http://springbook.no/files/fagedefim.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/22u8j9oasqcqrb38ha4hsuuum4/lafazepilonorubis.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d08d2f2f0af---58654491415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=getting+off+to+a+good+start+meaningPDF 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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16276 bytes
SHA-256: 474930f8c479b20310d8c63ff2ccd626d83b4a8e1cb48f0e94163da4d6271ede
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 10688 bytes
SHA-256: 0abcc29c323d62d3d55c92d2134ef75c64566f05f03ced242bfa181dbeb825bd
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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