Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b12ca37b2580f2…

MALICIOUS

PDF

101.0 KB Created: 2021-09-21 05:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75035154fe12479f3296ed1df1844b86 SHA-1: c8dfa334f911e5941c16ff95cc0432169bfc0927 SHA-256: 51b12ca37b2580f22fb0df6288a2766445691f1dcef5fabd39ef04534188ecb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=download+game+ppsspp+euro+truck+simulator+2 PDF link annotation
    • http://mitsubishilongbien.vn/images/ckeditor/files/90599163287.pdfIn PDF document text
    • http://fullx.net/files/56798842240.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210921035559.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492ea8ebb06---marurezutajuwiz.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wemeti.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/sosekaravigigep.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/91901447768.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/27405101221.pdfIn PDF document text
    • http://mamitobe.ru/files/file/76009524118.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/gesafeju.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192652164014.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/55972050415.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bewido.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141be04d77b5---damukawagijifinujiwukinim.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/63166083308.pdfIn PDF document text
    • http://lg-palette.com/upload/files/bulutazekebemobofiligage.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/rinetosa.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/visuzowaguzesejegurexow.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32147813571.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5f0eb518---nepekeveg.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tejekiw.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a7pmdje029nhv8gfs3imalp47d/kagikekuneboviwitizewog.pdfIn PDF document text
    • http://npas.ru/pic/file/lurugijasuxetar.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/bosenoxedijomiva.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/11011108117.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/48915579861.pdfIn PDF document text
    • https://tekmaker.com/upload/files/36997317773.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_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 21644 bytes
SHA-256: 267f5514e04bd8601cacce525425754c5f60cb791fd587758cea7a30e5dcb983
font_02_sfnt_off00016bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF2 11256 bytes
SHA-256: e3d029a5f6fdad1ca4d0b174635e220ecace24c8297fce77270076dc8042f2fd

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