Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd70ed146c929f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 10:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 231055b7f019dcc7c3086fab3279921e SHA-1: 3d391d078102e9d3158fb2833da59c650c130a47 SHA-256: aefd70ed146c929f9f379cdc63a90f1e5b3c765bd3f6d65d3071625bb7b41c54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://infrive.ru/uplcv?utm_term=bin+bulaye+baraati+720p+bluray PDF link annotation
    • http://vodova51-53.cz/files/vinetodugixatuvobezor.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/17754428733.pdfIn PDF document text
    • https://ccskin.com/geektic/files/41620551548.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jesuxoxelowi.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/80951230855.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/94983430086.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/32824150795.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/dewozokov.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8b312ed6---15373334537.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/lixod.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ilpa72quqfchgeumpvakejua84/nigagidavebezonelif.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/fijejoselivufelukoveki.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/dugipinu.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/47269393983.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/83918040700.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/22909278108.pdfIn PDF document text
    • https://gangnampools.com/contents/files/xelewe.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/6777539591.pdfIn PDF document text
    • http://state-lithium.com/upload/files/gozoluwefig.pdfIn PDF document text
    • http://teraval.cz/res/file/kupefudevikurejum.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/47745053367.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fea96b6283a753114a3e3e74000f36f3/88982410563.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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 18272 bytes
SHA-256: 917c534b55b9e3702b215f87799b93e218219539f2971d418ed77f0d274186df
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10656 bytes
SHA-256: 09063db5623ce2bf35878bc15f0dd24316a162de1a98b6a081a33f73bd99ef6f