Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4f81c45c19d169…

MALICIOUS

PDF

83.6 KB Created: 2021-08-25 05:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c399f26d98cb44b1e09056cf6a523027 SHA-1: e08f5508e3e2251237d39e9772e4ef3b73062430 SHA-256: ae4f81c45c19d169bd9940f6dcc9638baedce6f12611cf9d277f4893b7a3cf7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised websites, likely intended to lure users to phishing sites or facilitate malware downloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious content through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://medvor.ru/uplcv?utm_term=original+3d+crystal+puzzle+dumbo+instructions PDF link annotation
    • https://euroroma-bg.org/files/file/nubiwafopivelamowolebanex.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079016875b71---19195590487.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/mudepuxa.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/92dba0845c7a4543c7177b3db6df270e/libitevisokuge.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af921713636---dimupebuzanafepojujuzani.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/13395540.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/pujenovadej.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf64a250b---62222600706.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7dc6d98dd---nolabefoxepikosenures.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/85351589534.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/84370648848.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/godibidudoke.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/tuvivuz.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/91175566015.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988254cba9d---kasojifizefij.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/mufuxizexexobo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d723de7c2---43290302582.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0242b71ec---49183716595.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/wipurabafowatupinovo.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/44295452805.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/juvexego.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9bf88512f---42296873992.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/pepujamujamokabetane.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b23025beaf2---79006600835.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a35i0n2ffuhatenib4okvpv7iphhr4lp/53794680574.pdfIn PDF document text
    • http://sdds.be/userfiles/file/53524819595.pdfIn PDF document text
    • 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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 11468 bytes
SHA-256: 83178142fb0b4c1539569db8d64613c5d6decea09aa4ad8ae35fe14ca9ff648e
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 17204 bytes
SHA-256: b9d0ba7aa42f5ca3bc519effa7c7fca39f3df6eccc9767e770135e8e9b701687

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