Malicious PDF — malware analysis report

Static analysis result for SHA-256 86747ba64b63e3a8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 08:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d24a7d3eb1e34bdd28a720c56a73ad20 SHA-1: 6ca4f0cf0abdffb10ccb61176a3e5bf0e21432cc SHA-256: 86747ba64b63e3a8e26e9c9fa1df167e5d9f9d0733ed111e17d97458cc67af32
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable but serve to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mallorcaboom.com/res/wysiwyg/file/sibakukifuwuge.pdf In PDF document text
    • https://hse.tw/upload/file/7968134554.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/73020324442.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362f0750fce---pofuxigurego.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/budini.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/zitojuk.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/17414154575.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/gawumonasodavupofi.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jabejopesoxinamibegatetux.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/91874008061.pdfIn PDF document text
    • http://badgerhillfarm.uk/wiwenakazuvewevunasukef.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/waseseveroka.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/pemusiso.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/jinejolo.pdfIn PDF document text
    • http://kite-surf.sk/files/sigube.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/57352366596.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/nezemojegizi.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/wegesimijis.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/31502621304.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/mazowefolebijixotobagelub.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3869c962---zagojepabegiso.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba8641ea5---45745331106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+put+live+wallpaper+on+iphonePDF 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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10424 bytes
SHA-256: a67e34e7e32314359694998ecbc83c8865c0bc03a5ff6163d32c740b7ec9da46
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 18208 bytes
SHA-256: 9f79fd22703bc6f23360a18c27705ba6f781c81c165976ebfe534038eee5d166

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