Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c6bd380ec228e6…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 05:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 49dafa58f4b338c2a1f4beaaba369242 SHA-1: d49206e025d89ebc5f772267028a020bcafe624f SHA-256: 72c6bd380ec228e63e9ddfa429b4c6c0b077342e80c8d6608a276d2fd68dd81f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xididekizejemadudexu.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/786d75f784b7f3ad1580c7f2766e791a/55928252570.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/84531826694.pdfIn PDF document text
    • https://menu2uplus.com/images/file/82915543069.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/varusuwevafunudev.pdfIn PDF document text
    • https://seger.cz/userfiles/file/vitanusasamaxivaxa.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/noleb.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/dokofabuvarefariwesuwekod.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/88377412395.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109070635247219.pdfIn PDF document text
    • http://ccadl.com/files/20210914122747.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1840171546613ba14838dea.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/wudekufuwipesudu.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/93011313638.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614671a33c44c---69459809962.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/31656892919.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/34561351966.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/100745044.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/zakipujebokivelopewipewi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f732834c25f50605017dc0da48ea960b/wewajufotoro.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/40177899156.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/78553872633.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/35675861295.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/kegevavuzokipijasetupa.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/wetuzuwajoxekubutev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=app+emoticon+per+androidPDF 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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 10444 bytes
SHA-256: 6eaf335a10602427a3a63cf83ddfe14c5e6cb5d24e63380b31f32c5408014fe7
font_01_sfnt_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 15104 bytes
SHA-256: b4c1f255f08501b11f7d59ca3ec7f9b5cae495fc8f83038194197c40af6974ca
font_02_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1