Malicious PDF — malware analysis report

Static analysis result for SHA-256 b874f7063e70804e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-04 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0ff70f42cddf3c16cbeb16ca396b7b8 SHA-1: 3975c724380e399f3cee88f3db032beac1f8b2e2 SHA-256: b874f7063e70804e1cff609725b010a45e1bcf48e7419ac703f0fa2735b547bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links and the overall structure strongly indicate an attempt to direct users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f584f24a18---beworovarulukerogowigodob.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd06fff0cf2---lusavapelujekowuve.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/887afqpv5a1bfm0vjni5s7s9ov/96760431144.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1766fcb390a7e8e83f5f4d85b33b1bc3/55981662719.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/37227957133.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731eee67b23---81782518423.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5ab9e107c3890fb23d7ec44dacde4844/45048929659.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9f84cb2e6bf7223d651813509f894834/nusokejeniga.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-30/images/files/norepefikawir.pdfIn PDF document text
    • http://findusafranchise.com/files/files/dobuzira.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/mijuvemutofiravetozas.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/44587808557.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce23308a555---nabawaton.pdfIn PDF document text
    • http://fields-on-earth.com/34285112931.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mopufeni.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/13386389169.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/83366083510.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f3229da9f4ed9a1c75e796488080ffd0/kuvusogujexesusexe.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/nidirukeleridoj.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d694e4bbd57---53744685068.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bogitiv.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ddb2a5d95---65871511735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=toyota+rav4+2018+owners+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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 18932 bytes
SHA-256: 8e63a6b7a6a5ccc8cefd0c9cef5ffe7e4f0f6e58ef1407e062d06dd277584fce
font_01_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 11084 bytes
SHA-256: 59ef8f2e42a0b41d5db9123ff04aff4cc34e84a9fb59a80ffbbfbb896d62aef0

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