Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78047a03a4d8ec4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 05:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fef4f396f5b9cadfd7b5906a2f8cade SHA-1: bf6cebb824337fdec14b2b6e6fde986853fb7ca4 SHA-256: b78047a03a4d8ec4178580ccd3222f27dae49f6411757335507b1882c0cd36ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to a malicious destination, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tienhasteel.com/app/webroot/upload/files/28099838148.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/gorufatekutububo.pdfIn PDF document text
    • http://ijfbn.com/editor_up/86973480600.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6caff9019a370064b35dc29f88e3d31b/36455386807.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210713_201933_3103.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9557390d69ad865adf31c3816d397346/67312807162.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wozemidatakulik.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/lusokuxixume.pdfIn PDF document text
    • http://sns.hu/_user/file/18456886576.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaposo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c3bb1fdbfd4cf0d5877697980adfe8b7/21320183635.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/rawuwavo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e8bacd93c138390226b246313a77a498/36246387210.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/96420584431.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/vozopalolajopiditopaku.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/17566352587.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/waxubunazusetevimekubuli.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c83hb65eqngn3eorvc3vl1hi73/18719948.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/52897190625.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/32617610680.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xegisemizuvemuruvi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hssdnj8rid94kp2a5f4lv8cbkk/13044824706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=advance+in+academic+writing+2+pdfPDF 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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 18792 bytes
SHA-256: 9b512d35f37a1de3c5f5581f514c75694465f1abc82ca9f14232626c43c48589
font_01_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8E 10884 bytes
SHA-256: 91b4ef2c6a0acd2bd6bf0777b53c4231a14bf12387cc1721c36bffe13a305884

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