Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b602b0a6ba996b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 19:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 358077aa1a22186842f07312cd946131 SHA-1: dfc39da1ec111dea9f42ab7d75cb3fc0c8d28326 SHA-256: 60b602b0a6ba996b63381c6627063b2e393cc78ecc339fc90666440fcb73c3c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The presence of multiple links to various domains, some of which are identified as link farms on disposable hosting or compromised CMS uploads, further supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medica-brno.com/files/kuxajiwofiwosikimuxirod.pdf In PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/65636420530.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/95268049323.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/nojogemajawaza.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350a708845---regitosaxotir.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/97951718397.pdfIn PDF document text
    • http://rafaelokazakov.com/file/39450109283.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/tufojev.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/2409384050.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3a2896b881ed0b4d07d011bb1709de0a/54626380696.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/morixanusaf.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/967a9ad83c4886b29412b71105c1379b/gasadukofe.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/41982461047.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/91216665991.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/nezukugiwuf.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/82804164346.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2da5f506925737c83ee3f4933c6a2d4c/jatininirepul.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/78954452512.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210829093334625.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sasabamewokesu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/13114683.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/td8omps489bm6fii56c9kg0au1/12533325758.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/32674273677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=feudal+system+worksheetsPDF 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_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 10684 bytes
SHA-256: ea68f7f1efe61c7dbbdf9bbb61455605dc4f1ccd3f416087afc0a987a40e237a
font_01_sfnt_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 17108 bytes
SHA-256: f04c64ebe809d3628ca0cac96610603778ebf533f0bf74f97ff696c7b07e3093
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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