Malicious PDF — malware analysis report

Static analysis result for SHA-256 2508df32e5f9d0ab…

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 15:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c8f026a4ef8bffedceb8fc98a9825531 SHA-1: 4da3c8aff559c2752f64c0d60d0b3e8f849536f1 SHA-256: 2508df32e5f9d0ab0e602300e3b7c7dbe5e60ed374ef71debdbaa0b7094886cd
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://onlinecommerce.bg/uploads/pages/files/regitiveboresej.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/jekop.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/sokaxusov.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zunowake.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/boxixawapujexabibuxoj.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/20964932856.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/91737726622.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/34527929964.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/lofejunebebuwuguvugide.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zodamabijemewukuf.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/63396834100.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/21891055890.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/xezitiverivajir.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/8240745497.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/xozogenakomete.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317667302c1---86299492323.pdfIn PDF document text
    • http://iscelenie.info/files/file/46960976505.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3be17ec6---joguxutolituwinekerego.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/mevotewewadolota.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/zoxiwarujatifew.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354700698f---40689394989.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/tepeliwu.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210907033553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=create+3d+game+in+unityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 18588 bytes
SHA-256: 990c1c14a810ccdb735f4ffbf1ec7b007c3f557a28527f2b5af3a59ce76b1906
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 17432 bytes
SHA-256: f50f458ab679ae87284670b19349462b17c4d9ac20e40dff5fe746068ae7415b
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10672 bytes
SHA-256: a49baca144edb021379fe1e1f7f1a2cf8a1cda909aa29cf0ff3081256d9bb8cf
font_03_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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