Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c3ce6e2835274f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 12:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7f1b9b43d6a36e48742d8d6df5921bb SHA-1: 232e1117b168169233aa20b39bae1364ef6be1e6 SHA-256: 20c3ce6e2835274f3151b1377e4ecdd946b5f6580e2f4cad10ddc05145021f84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised websites, designed to trick users into downloading further malicious content. The presence of multiple links to potentially compromised CMS upload directories suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sofanet.ro/ckfinder/userfiles/files/16376226737.pdf In PDF document text
    • http://guerrazzi.info/userfiles/files/89397329911.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/9526600888.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/26d9206cce25a6e817afa90320067033/pujiwexexi.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/71934761211.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/18057108998.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/lowepizajizu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/51oi4mt325sulndgp4v3106ra4/37069384211.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/95661569824.pdfIn PDF document text
    • http://citranco.com/users/files/nuzogojusasetu.pdfIn PDF document text
    • http://thecuriosityshot.com/sisejonevokezu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c98db7cd---96218654152.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/60676990863.pdfIn PDF document text
    • https://istanajp.net/contents/files/buxosolesesafe.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/nedujuban.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/26768966918.pdfIn PDF document text
    • https://educhina.mn/editor/files/jujutuzuxonuguwo.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jefabifulasaw.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/bamatiwujivoni.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/rebojusejuvumo.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/9715160335.pdfIn PDF document text
    • https://argumentua.com/i/file/lidemewupakibogopox.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091005110991982.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pixuwupomameb.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kiderewotedulukopamatibeb.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/096bfb08409d88704f0857586b1a2f35/8981867480.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109011044123701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=league+of+legends+mobile+beta+apkPDF 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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 11028 bytes
SHA-256: 2be499ebe497a49e3d119d049b56c94b65e1a9158c9c1097775852cd0742e1c4
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 17456 bytes
SHA-256: d2e5b54b15da3d23b60afea4980abaaf78d454d0585b7096078a167339a11583