Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef046cfce82d743…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 04:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63bb2c15f6927a17b2ddfe6b282dc47f SHA-1: 8a698e1ee5924aa0922eba8f29060bb33051aba7 SHA-256: 8ef046cfce82d74386ec9e492d844b587835c720def0e52f50202e762350ef1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://laborke.ru/uplcv?utm_term=albite+pdf+reader PDF link annotation
    • https://eksiliotomotiv.com/upload/ckfinder/files/44962010120.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607132b48b8e0---25580259412.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nubunen.pdfIn PDF document text
    • https://sbufficio.it/file/37708966939.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/30197838365.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/70031281219.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/foxobexefetani.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/80905521128.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/5e65d7ad3d28fcfae291833e23c5c405.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/mazoxisenuzujenofan.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607622701e6bb---41976635085.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/84310535025.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb6da63f60---piropuzoxelekemijunapibuw.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/xadigewerozamotisogebisos.pdfIn PDF document text
    • http://rld-carbon.ru/file/wunuxas.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/01/24480149310.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/42490029242.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/telefuzuwogurabevaze.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mazane.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/kunesig.pdfIn PDF document text
    • http://yuha.be/_files/file/bufokomutobawobox.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/67875559457.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080df9442425---xatorafafowiroweposamogo.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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 21832 bytes
SHA-256: 35c8abde3008fdc68110fe3bae11b708995b6202a1c9618796dddcea014dd5ac
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 10220 bytes
SHA-256: 49b02773bbfacbfd1895f214c63c4fe4cc8a9fb572bfc3cf42c2b079a8a76b85
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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